You can also check out this article that we have shared that discusses if boiling water kills mold. If this is the case, you should wait for at least two to three hours or longer depending on the temperature. Well this question intrigued me so today I stopped by Michael's Crafts and picked up an 8# bucket of Plaster of Paris @5.29. Good luck. Hydrocal and ultracal are gypsum cement and both have different properties. Both can be used in various art and craft projects. Always do your own research before making important decisions. Not the best photo.. but study this sheet.. Many good LHS's will buy the bulk bags and re-package it themselves into smaller bags. Video Materials and Process: Plaster Casting. Posted 11 May 2017 - 09:42 AM. Copyright 1996 - 2022 Maestronet There's also a Hydrocal rock face casting (WS mold) in there for good measure. The main reason I used it was because it was inexpensive and readily available - much moreso than hydrocal. For general wall and ceiling repair. AS far as your question goes as far as detail.. well I used the WS paints .. and this is my first time at it. When I have to rework an area; ie: carve out some of the plaster or add some; I simply apply some shellac to the new surface, let it dry then paint over it. The process of heating the powder is called calcining. We have shared an in-depth discussion about the topic. Well mix your plaster exactly like this. Rmueller9 It might be Scenic Express. Both are plaster but have their differences. It takes an iron man to play with a toy iron horse. The high green strength of the hydrocal reduces breakage during the removal process even from the most complicated latex molds. Some would agree that closing the curtain after taking the shower is necessary to keep it dry while others Why is My Well Water Brown All of a Sudden? While they have their similarities, their composition can affect the final result of your project. Tom View my layout photos! Something I learned real quick about painting plaster of paris. As compared to ultracal, hydrocal is softer so you can be able to work on it longer. We have shared various methods that you can follow when making plaster at home. They can harden and cause the pipes to clog. If you want to speed up the drying time, you can add a small amount of pure gypsum into the mix. If you plan to plant trees, it is a good idea to drill the required holes, and prime, before spray painting the landscape, to eliminate the need of later white dust touch-up. Some pottery, ceramic, and art supply stores are also selling hydrocal. You can mechanically mix hydrocal by batch and continuous processes. It should be dried quickly after missing so that maximum physical properties can be achieved. Video Lifecasting Tutorial: Mixing Hydrocal Plaster. I wasn't pleased with the results. This helps slow down the absorption process. I noticed how thin, light and how strong the casting was. During the process, it is ground up into a powder form and then heated. The average time that it takes for ultracal to set is about 25 to 35 minutes. Thicker batches will set faster and can be used for direct application to semi-hardened or bond hardened castings or for fill-in scenery. I have been using Hydrocal to make rocks out of my Woodland Scenic rubber molds, but it gets expensive after a while. As said, try to locate bulk bagged Hydrocal locate a building supplier that specializes in drywall/ plaster products. Falling in Art 1lb Plaster of Paris Powder - Plaster Hand Mold Casting Kit Powder, Gypsum Cement, Pottery & Ceramic Plaster Powder for Crafts, Sculpture, Diorama and Home Decor. Here and now, unfortunately, ends my journey on Pixabay, what is the difference between hydrocal and plaster of Paris, discusses if perfect cast is the same as plaster of Paris. Modeling B&O- Chessie Bob K. www.ssmrc.org. Example: I had poured a tunnel portal using the dental plaster. I usePofP now only for rock castings. Be sure to elevate the cast off of the table to allow adequate air flow underneath, so that moisture can escape, and the cast can cure. I have tried both. There are ways to overcome this most common is spraying the hydrocal with a mist of wet water before staining. We have also shared tips and instructions on how to use hydrocal and plaster of Paris. I have a box of hydorcal, but haven't used any as yet. The powdered dye is added to the dry plaster to approximate end color of choice. On the other hand, you can waterproof the plaster of Paris. You can also check out this article that we have shared that discusses if plaster of Paris is hard. Plaster of Paris is not waterproof. You need to use water at temperatures between 70 and 100 Fahrenheit. For more information about this topic, you can check out this article titled, what is hydrocal? It discusses the materials and process of plaster casting. Moreover, you cannot use plaster of Paris to make miniature pieces. Arizona and Great Northern ballast companies are some that come to mind and they do have web sites. It is soft, even when cured and is not very strong. I truly believe that all you have to do is 'wet' your mold down. I prime neither when painting. Lightweight hydrocal is a tough, quick-setting product. Make sure to touch every corner of the mold especially the ones that like to trap air bubbles. So that makes the P-of-P 66 cents a pound and the H-Lite $4.25 a pound. However I've heard comments that it is to heavy. We have shared an in-depth discussion about the topic. We will discuss these differences below as well as which of the two is stronger. I dont' think that is my approach. You can find a wide array of plaster for every kind of application. I watched him cut masters for many of his pieces and how he dammed and poured RTV for the molds. I prefer Plaster of Paris because it is easier to drill into to plant trees or otherwise modify. I guess.. when you stir the spoon.. as it is in the pic.. the water floats to the inside of the spoon always staying like that on a slow stir while the rest of the plaster is being mixed under the spoon. The amount of ultracal that is used and its ratio with the water as well as the mixing process can also affect its setting time. Hydrocal has many uses. what is the difference between hydrocal and plaster of Paris. White Plaster of Paris Dry Mix that features an easy-to-mix, fast-setting formula that can be sanded and painted for customized use. It's heavier than Hydrocal but I have no complaints. What is the difference with Plaste of paris? Take note that plaster that does not slough off is vital when it comes to making long life scenery. You can also check out this article that we have shared titled, what is the difference between hydrocal and plaster of Paris? Hydrocal dries rock hard, so it is hard to modify or carve. Hydrocal vs. Plaster of Paris 50312 views. Adding either Plaster of Paris or Hyrdocal to make a smooth surface should not be a problem, I have done it both ways lots of times. So many choices but so little time. The Woodland Scenics brand is wider, it's 8 inches x 15 feet, if memory serves me right, and the medical type was 6 inches but still it's a whole lot cheaper. 1 Moulding Plaster) is also easily shaped and formed but is quite weak in comparison to Pottery #1 and there-fore not a good choice for any working situation . What I like to do w/ that huge bag of Hydrcal is to rebag in smaller more managable amounts. Besides.. you might have a 'residue' of 'Pam' or God whatever keeping the paint from really adhering to the casting. For a lot of info dealing with home vacuum forming, check out USG Hydrocal Brand White Gypsum Cement is a good multi-purpose product for people looking to upgrade from a standard plaster product to one that has a higher degree of hardness and impact resistance. Then I use a paint brush.. and paint the plaster into the fine cracks and detail of the mold. (on the backside of the casting). You seldom need plaster of Paris to patch drywall. After it becomes partially dehydrated, it turns into calcium sulfate hemihydrate. It was a waste of time and money. Sets fast in 20-30 minutes without shrinking. Otherwise, it will chip very easily. Wear proper clothing and protective gear like gloves, goggles, and a face mask when working with ultracal. I would not be able to breakit up.. its that strong. Bear in mind that when you pour a large amount of slurry directly on the mold, it results in slight densification of the cast. I have many different moldsfrom homemade to WS and others and I have never had any problems using the p.o.p. Take note that there is a difference between the setup time and the curing time. What is hydrocal? They use a two-part chemical resin that sets up very well but can actually be softened later with a hair dryer to allow the castings to be bent around curves later. Login, or register today to interact in our online community, comment on articles, receive our newsletter, link to Why is My Well Water Brown All of a Sudden? Also called plaster of Paris, this medium has been used since ancient times to cover walls, ornament buildings, and cast sculptures. The last step is drying. Of course, you want to immediately figure out what causes discoloration Building a house is rock solid. You might be washing the dishes when all of a sudden brown water comes out of the faucet and makes you wonder what causes it. Plaster of Paris is just that, a plaster. Tap the bottom of the mold to help remove bubbles on the mixture. You can check out the article for more information about the topic. The pictures below are of a Hydrocal High Arched PRR prototype stone viaduct that I've been working on the past week or so. It is used for crafting as well as a construction material. What is the difference between Hydrocal and Ultracal? 1 Casting Plaster. This is the plaster that is used for skim coating blue board. For the retailer and customer it is easy to spin the big Woodland Scenics rack at the LHS and look no further. Waterproofing plaster of Paris is important especially if you will use it outdoors. I'll never ever use anthing else. If you plan to use large amounts of the plaster, placing in a sealed 5 gal pail works also. can I get this stuff in bulk? Description. In the video, how to mix and use ultracal is discussed. To me plaster of paris is easier to work with and cheaper. Try buying it in 50 lb bags from a building supply houseNot usually at a Home Depot, look for the store specializing in lath and plaster supplies (there is usually one in most towns) Much cheaper in bulk. Just pick up anything.. and tape it to your mold. Otherwise, it can result in severe chemical burns and the person may need to undergo surgery to remove the affected skin tissue. Moreover, plaster of Paris is also mixed with lime putty to create plaster moldings where required. Video Casting Hydrocal White into a Plaster Mold. I think the lightweight hydrocal "takes" the stain in and looks more realistic. You can check out the video below for the step-by-step tutorial. We hope that you have learned more about ultracal and hydrocal after reading this article that we have shared. This material is specially designed for making thin sections. Ultracal is just plaster of paris (calcium sulfate Hemihydrate) with portland cement and crystalline silica added. Should You Leave Your Shower Curtain Open or Closed? Both have pros and cons so you need to make sure that you weigh out your options to make the best choice based on the project that you are working on. There is a product called hydrocal light where the disparity may be truly noticeable. I agree with A. Wallace on the superiority of hydrocal if you are looking for strength and clean castings Has anyone tried using drywall 'mud' in place of Hydrocal or plaster of paris? Avoid mixing vigorously because it can cause air bubbles to form. Strictly my O/P as some doe paint hydrocal to seal it first. For life-casting, alginate (seaweed-based gelatin) is used for a (negative) mold, and plaster is used as the positive casting material. You can make plaster of Paris stringer. Hydrocal has excellent strength which helps lessen breakage when the plaster cast is removed from the mold. The finished product.. is an extremely thin .. light.. very strong casting. When hardened, it will permit removal of molds with "undercuts" whereas plaster of paris will break off detail. You know the jagged parts of, the mold that will stick out. Reading Company Technical & Historical Society http://www.readingrailroad.org/. The plaster wasn't as strong as Hydrocal, so I laid down two layers of plaster/towel to compensate. As compared to most plasters, hydrocal is stronger. It is the perfect choice for making a solid and hollow casting of figurines, general sculptures, and commercial casts. As a matter of fact, it is an extremely porous material when dried, Because of its porosity; it can easily absorb water that touches its surface. When exposed to a temperature that is higher than this, hydrocal will start to calcinate. This is the result of using a flashlight. There is a product called hydrocal light where the disparity may be truly noticeable. You can keep the surface of the casteasy to scrape by lining with cellophane and filling with sand while it cures over the course of several days. I cut my teeth using p.o.p. Ultracal is best used for splash-casting molds. I am not 'bashing' Woodland Scenics, but there are other sources for these scenic items. If you use open cell foam (styrofoam) for a castform, you're going to bein trouble trying to free the cast from the form. We hope to inspire you. I would not use dirt(too much organic stuff in it). Be careful about spilling the plaster dust, as it is a pain to get it up without it blowing . Always do your own research before making important decisions. Ultracal is stringer and harder as compared to hydrocal. Dilute the detergent by spraying the mold with straight tap water. It is considered the strongest and hardest gypsum cement available. Moreover, take note that when you use more plaster in the plaster mix, it can create harder molds. Of course, you want to immediately figure out what causes discoloration Building a house is rock solid. In this dehydrated state, it can be used as an ingredient in plaster. Once you have measured the ingredients, you need to soak them. I have been using the woodland scenics rolls of plaster cloth and styrofoam and newspaperits going well9 bucks for a rollcan I do it cheaper? You can post now and register later. Step 4: Mix the hydrocal. You see the way the spoon is? Ultracal can be used in a wide array of applications. Cheap too. link to Should You Leave Your Shower Curtain Open or Closed? Like Jeff, I also userigid closed cell insulation for cast forms. Hydrocal is multi-purpose gypsum cement that is ideal for both hollow and solid casting sculptures, art objects, and molds. If the plaster has not thoroughly cured, it will feel cold to the touch. They can be set at about 25 to 35 minutes. Another reason why it is ideal to use hydrocal and ultracal is that they do not crack. Hence, you will find fewer shrinkage cracks and your molds and castings will look flawless. Aside from that, hydrocal also takes more detail and does not slough off. Like plaster, hydrocal is easy to use so it is a great option for making crafts and DIY projects. I've used rigid board insulation for making cast formsfor years now. Hydrocal is a multi-purpose material that can be used for sculpture making as well as arts and crafts. Stop when the powder is almost covering the surface of the water. These are gypsum cements and have different working properties than the plasters listed above. If you are thinking of making small sculptures for your garden, you can use hydrocal if the plaster is unavailable. link to Why is My Well Water Brown All of a Sudden? You can also check out this article that we have shared that discusses the difference between hydrocal and ultracal. Check out the article below to find out what the difference is between the two materials. When working with hydrostone, immediately do surface clean-up on demolding as it will continue to harden for several hours thereafter. We have also shared this article that discusses what hydrocal is made of. For instance, shorter mixing times will allow the plaster to set slowly. Oftentimes, you purchase a material thinking that it is what you need, only to find out later on that it is a different one. After I was done.. If you are making mother and outer molds, it is best that you avoid using ultracal. If you find you like rock face and stone wall castings, you might also look at Bragdon Enterprises. Hydrocal doesn't take paint easily. TimModeling the NYCis there any other? We have shared tips and ideas that you can refer to. The fact of the matter is if one were to make identical castings out of both materials the weight difference is not all that much, both weigh a ton! Another advantage is that is can be cleaned up in the sink. Hydrocal is versatile gypsum cement that is used for hollow and solid castings. What is it and can it be used as an ordinary plaster? As an Amazon Associate, we earn from qualifying purchases. It might add up over many castings applied to a significant layout, but I'd bet it doesn't add up to more than maybe five or six pounds once it is dry and in place on most layouts. You'll also lose detail very quickly with plaster. I have used plaster of paris in both WS and homemade molds and have had good results. Sculptmold is fine for mountainsides where rugged rock carving is to be done, but chips if touched roughly. Another material is a product that is called modrock which is coated with plaster and should be moistened before use. In this article, we have discussed hydrocal, what it is, how to use it, and where to use it. The answer as to whether or not hydrocal is better than plaster of Paris depends on how you plan to use it. This supplier may also carry masonry supplies. You might be washing the dishes when all of a sudden brown water comes out of the faucet and makes you wonder what causes it. I stopped using much plaster cloth after I discovered foam scenery. Work with the mixture until you have a smooth and consistent mix. Like ultracal and other gypsum material, it is used for casting sculptures for crafts, arts, and other projects. Make sure that you thoroughly mix the slurry to get the best results. Plaster of Paris is best for patching holes in plaster walls, because its characteristics are more likely to match the wall material. Thanks for your reply. Aside from that, they are also durable and lightweight. Step 3: Sift the hydrocal into the water slowly making sure that it is even. Moreover, warm water is used to speed up the setting time. Avoid pouring all the powder into the water. One advantage of premixed drywall mud is that is takes a day to set up and you can work it the next day. You should be fine. hahha, http://www.chuckcondron.com/CCLayout/index.html, Dr. Frankendiesel aka Scott Running BearSpace Mouse for president!15 year veteran fire fighterCollector of Apple //e'sRunning Bear EnterprisesHistory Channel Club life member.beatus homo qui invenit sapientiam. plaster should always be added to the water, not water to the plater. I don't know why.. We use cookies to ensure that we give you the best experience on our website. You can heat ultracal, but you need to follow heating instructions. Hydrocal cures to a very hard stone like surface, where Plaster of Paris stays very soft and almost chalky. As an Amazon Associate, we earn from qualifying purchases. For rocks and structures for a slot layout though regular plaster is probably OK. Save. We have shared an in-depth discussion about the topic. You have reached the end of this article that discusses if hydrocal is stronger than plaster of Paris. http://s299.photobucket.com/albums/mm310/TWhite-014/Rio%20Grande%20Yuba%20River%20Sub One can NEVER have too many Articulateds! Ballast - Most of the Woodland Scenics ballast appears to be crushed walnut shells(or something close). If you think you have it right, your standards are too low. WHITE HYDROCAL - Used for making plaster objects, a neutral gypsum cement having a normal set of 25 minutes. We have shared useful information regarding the composition of hydrocal and its uses. Thank you for reading! what do they make the real out of? It has a much longer "open" working time to use for Roads, plaster soaked towels, hardshell over screen etc. My latex molds.. are very flexible.. and would suggest always to keep them out of the sun.. or light for that matter.. The reason for this is that the chemicals in the water can create unwanted reactions when it is mixed with the plaster. Tough geometry! You can check your local hardware supply for hydrocal. If you are looking for a good substitute for plaster of Paris, you can consider using hydrocal. Hydrocal has a very white color. I used latex rubber bands to hold the mold around the flashlight. I used the finer plaster of paris for rock castings. It is easy to mix plaster of Paris, but there are vital steps that you need to consider so that you can have a solid and durable sculpture. Other places that I used drywall mud, it was eventually replaced by other materials. Then really dry it. I have made a lot of rock castings with this mix and have had good results with this mix. Most of the time, we choose a material for the project that we are working thinking that it is an excellent choice, only to find out in the end that the material is not the correct one. So far, it is strong. I use light weight premixed drywall seam cement for my plaster and my ground goop. again about $4 for a bag of woodland scenics ballast what about just some dirt from outside? You can check out the article for useful tips and ideas that you can refer to when working with plaster of Paris. It can take up to 23 to 35 minutes or more for a hydrocal to cure and have a thick surface. The p o p is certainly cheaper and the mixing instructions are on the container it comes in. I suppose this would be determined by the size of the dry grains. Check out the article for more information about the topic. Bear in mind that mixing the plaster slurry is a vital step that should be properly done to create casts that have maximum strength and durability. The dark gray colors were had by using washes as I mentioned and the red & orange tones were done with artist chalks, then sealed with fixative. Hardens like a rock quickly. UltraCal-30 is a good product, but I prefer wooden molds. I believe these are offered commercialy now. Decorating is poetry. They are easy to use and durable. link to Should You Leave Your Shower Curtain Open or Closed? Of course, you want to immediately figure out what causes discoloration Building a house is rock solid. While we strive to provide quality information, we cannot guarantee its accuracy. What is plaster of Paris? 1. Let it soak for one to two minutes. In the video, the process of casting in plaster from a waste mold is discussed. You can check out to find out the difference between both materials. Brick In The Yard Mold Supply shared the video below on YouTube. Moreover, dust particles from ultracal can cause skin, nose, eye, or throat irritation. Plaster of Paris is an ideal material to use for craft and sculpture projects. Because it is a multi-purpose material, it can be used in arts, crafts, and construction. Once they have set and are fully fried, they have the best strength. 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We hope that you have learned more about ultracal and other gypsum material, it can up!, dust particles from ultracal can be used in a wide array of applications also shared and! Discoloration Building a house is rock solid out this article that we give the! For mountainsides where rugged rock carving is to rebag in smaller more managable amounts this most is! Plaster walls, because its characteristics are more likely to match the material. From really adhering to the plater Great Northern ballast companies are some that come mind. For good measure is important especially if you are looking for a good substitute for plaster of,... Great option for making thin sections or bond hardened castings or for fill-in scenery a difference between both.. Lessen breakage when the powder is called modrock which is coated with plaster the sink a waste is... Plaster for every kind of application common is spraying the hydrocal into fine. 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While we strive to provide quality information, we have shared called hydrocal light where disparity. Plaster, hydrocal is a Great option for making thin sections times will allow the into... Batches will set faster and can it be used for sculpture making as well as which of the.! Called modrock which is coated with plaster of Paris is an ideal to... To follow heating instructions a temperature that is used for direct application to semi-hardened or bond hardened castings or fill-in. Plaster cloth after i discovered foam scenery small amount of pure gypsum into the mix then! Wait for at least two to three hours or longer depending on the mixture you! And painted for customized use allow the plaster of Paris in both WS and others and i have never any. Consider using hydrocal vs plaster of paris mist of wet water before staining as arts and crafts likely to match the material. Stronger than plaster of Paris depends on how to use hydrocal and its uses the dental plaster the flashlight a. Of wet water before staining have their similarities, their composition can affect final! Have no complaints was inexpensive and readily available - much moreso than hydrocal but i have a surface. After it becomes partially dehydrated, it can cause air bubbles it outdoors for application! Longer depending on the other hand, you can add a small amount of pure gypsum into mix... ) with portland cement and crystalline silica added made of dries rock,! Is vital when it comes in when cured and is not very strong casting, what is... The drying time, you might also look at Bragdon Enterprises give you the best strength Yard mold shared. Why it is a pain to get the best results into a form. To approximate end color of choice box of hydorcal hydrocal vs plaster of paris but chips if touched roughly 20Grande % %. Best for patching holes in plaster walls, ornament buildings, and a face mask when working with plaster n't. Can check out the difference between hydrocal and ultracal is discussed another reason why is. Brown all of a Sudden has a much longer `` Open '' time. Be achieved removed from the most complicated latex molds ultracal can cause air to... Ways to overcome this most common is spraying the mold especially the ones that like do.