The mixed consistency will vary depending on its use. Oftentimes, you purchase a material thinking that it is what you need, only to find out later on that it is a different one. They are generally used for sculpture, patterns, commercial casts, and figurines. 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. While some of their components are not the same, both are made for the same purposes like casting and molding. This is a basic mixing method that you can use regardless you are making plaster for mold or casting with plaster. Thank you for reading! Step 5: Pour the slurry carefully into the deepest area so that it evenly flows across the surface of the mold. Mixing glue into the plaster of Paris mixture will make it more durable and strong. Leaving the shower curtain open or closed has long been a debate for a lot of people. It demonstrates mixing tips for white hydrocal. Hydrocal is stronger as compared to plaster of Paris. What is plaster of Paris? Combining both ingredients cuts the setting time shorter. What is it and can it be used as an ordinary plaster? Pick a smooth bowl. The difference between hydrocal and ultracal is that ultracal is harder and denser. It discusses what ultracal is. The patching plastic allows a greater set-up time for the hydrocal and permits better control of forming the scenery profile. 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 . CustomTerrain shared the video below on YouTube. Mix the plaster into the water before adding the glue. If you continue to use this site we will assume that you are happy with it. can I get this stuff in bulk? Calcium sulfate is mined and processed. When working on anything of any size plaster of paris will flake and or brake off at the edges. it seems I go to the hobby shopbuy a crap load of stuffand in about 2 hours im out of supplies! I would be interested in others experience with hydrocal. We have shared an in-depth discussion about the topic. If you want the best product for pre coloring the plaster, use "Powered" Masonry Dyes. Both work well. Video Materials and Process: Plaster Casting. Choose a drying room or oven that offers quick and uniform air circulation. You can check out the article for useful tips and ideas that you can refer to when working with plaster of Paris. June 5, 2018 in The Pegbox, I have used plaster of Paris for table and back castings for 25 years. With the base foam (carved for hills and valleys) and the Gypsolite, I only use plaster cloth to bridge over open areas or to merge in the foam with rock castings. In my last case, I had to do a full cast of the cello back attached to ribs and table. Some pottery, ceramic, and art supply stores are also selling hydrocal. I've also used other home-center type plasters (any type that you mix with water) and I really can't say if any of the others were much better or worse than plaster of paris. I often do this even with closed cell foam just to make it a little more slippery. You can check out the article for more information about the topic. I wanted its superior strength. I am happy with the detail.. and this is the best shot I can show you. Next he uses a 50:50 mix of patching plaster and hydrocal (or Plaster of Paris) brush-applied to cheesecloth. On the other hand, ultracal is a material that is used for making splash-casting molds and models. As compared to ultracal, hydrocal is softer so you can be able to work on it longer. I am really looking to spend less. The last step is drying. In this article, we will discuss the difference between hydrocal and plaster of Paris. How do you prepare plaster of Paris? Tap the bottom of the mold to help remove bubbles on the mixture. Hydrocal cures to a very hard stone like surface, where Plaster of Paris stays very soft and almost chalky. Plaster of Paris is just that, a plaster. It has a much longer "open" working time to use for Roads, plaster soaked towels, hardshell over screen etc. Avoid pouring all the powder into the water. 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. I watched him cut masters for many of his pieces and how he dammed and poured RTV for the molds. Shake off the excess water and lay the molds on the table to the floor. I've also used Bragdon Foam with a Bragdon mold. Nearly all the plaster available in the United States is manufactured by U.S. Gypsum, (USG). Hydrocal is multi-purpose gypsum cement that is ideal for both hollow and solid casting sculptures, art objects, and molds. Both are plaster but have their differences. You need to achieve a nice thick soupy consistency. 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. Hydrocal vs Light weight Hydrocal vs Plaster of Paris and Ballast Posted by VulcanCCIT on Wednesday, October 18, 2006 10:34 PM I have read about the WS lightweight Hydrocal.and I went to Hobby Bench and they had these brown boxes that just say Hydrocal on them. I have read about the WS lightweight Hydrocaland I went to Hobby Bench and they had these brown boxes that just say Hydrocal on them but I dont think they are woodland scenicsbut it seems to work fine. You can also add color to the plaster using poster paint or tempera. Ballast - Most of the Woodland Scenics ballast appears to be crushed walnut shells(or something close). They just re-package the same materials you can buy elseware in bulk. If you choked a Smurf what color would he turn? Hydrocal dries rock hard, so it is hard to modify or carve. Always do your own research before making important decisions. There is a product called hydrocal light where the disparity may be truly noticeable. While hydrocal is easier to work with when it comes to posting casting projects, ultracal is more durable. Moreover, plaster of Paris is also mixed with lime putty to create plaster moldings where required. a 10 pound box of this hydrocal was I think 10 bucks..so 1 dollar a pound. When mixed with water, a setting reaction takes place where the water recombines with the particles of the calcium sulfate. I skim-coat my construction-foam base and hills with this, and it gets rid of the flats and gives me a nice rough earth-like finish. It has a similar formula as hydrostone, duracal, and ultracal. Its stronger. Smack it on the table. link to Why is My Well Water Brown All of a Sudden? You need to let it soak for about one to two minutes. Always do your own research before making important decisions. All these castings are pre colored. Same can happen with hydrocal but it's far less likely to happen or should I say it will take a little more for it to happen then it will with plaster of Paris. We have also shared tips and ideas for using hydrocal and plaster of Paris for your art or craft projects. We have also shared this article that discusses what hydrocal is made of. I buy somebody else's Hydrocal in a big jar. You seldom need plaster of Paris to patch drywall. Leaving the shower curtain open or closed has long been a debate for a lot of people. Hydrocal doesn't take paint easily. If the plaster has not thoroughly cured, it will feel cold to the touch. You can find a wide array of plaster for every kind of application. End result is less air bubbles. Hydrocal is mainly composed of plaster of Paris with a small amount of Portland cement. I have read of some people treating the mold for a better 'release' of the casting out of the mold.. but I really frown on it. It will do just fine IMO. you get far greater detail then you would by painting. Decorating is poetry. Painted and sceniced those results were better than anything I could have planned. Login, or register today to interact in our online community, comment on articles, receive our newsletter, Both require extremely strong bench work even overly engineered to the point where it can support more then your own weight, reason being is the least little amount of flexing in the bench work and you now have a pile of white dust that you can clean up off your layout with a shop vac or a dust pan. Hydrocal and ultracal have high performance. Not the best photo.. but study this sheet.. Now, I use premixed drywall mud, over foam for the base, but still useplaster of paris for rock castings. Hydrocal sets-up to rock-hardness, and in many cases, will support a person leaning on it to reach distant tracks. I tried some WS lite weight hydrocal, but it was no better than PofP and cost WAY more. If you use open cell foam (styrofoam) for a castform, you're going to bein trouble trying to free the cast from the form. There are many firms that make real ballast(even prototype specific) for much less. Back in my hardshell days, I used tri-fold paper towels (10 bucks for a case, and I still haven'temptied the case), and patching plaster ($7 for a 20 pound bag, enough for a 10 x 20 layout). Choose an ingredient that you are most comfortable working with. On ballast.. Video Casting Hydrocal White into a Plaster Mold. You can also check out this article that we have shared that discusses what hydrocal is made of. While hydrocal is an excellent product, it is usually sold in really small packages and can be expensive. Fast-setting alpha gypsum cement designed for strong, resilient glass-reinforced product fabrication. Also called plaster of Paris, this medium has been used since ancient times to cover walls, ornament buildings, and cast sculptures. Moreover, the maximum temperature that hydrocal casts are safe from calcination is 120 Fahrenheit. Get all the moisture you can see off the mold. While they have their similarities, their composition can affect the final result of your project. As an Amazon Associate, we earn from qualifying purchases. Ideal for hollow and solid casting applications to create figurines, moldings and plaques We have shared the step-by-step methods on how to mix glue with the plaster. Ultracal is gypsum cement that has low absorption and is usually used for case molds. I also use Gypsolite (LHS, same big jar) which has a nice gritty texture. Make sure that the hydrocal is fully dispersed in the water before mixing. Pour 2 cups of plaster of Paris into the mixture. Each step is important to make sure that the hydrocal will work properly. After sifting the powder, do not start mixing yet. Hydrocal vs. Plaster of Paris 50312 views. | Guide for Beginners. WHITE HYDROCAL - Used for making plaster objects, a neutral gypsum cement having a normal set of 25 minutes. I stopped using much plaster cloth after I discovered foam scenery. I picked up my Dental Plaster off of ebay. For a lot of info dealing with home vacuum forming, check out Make sure to break up any lumps that form in the mixture using a spoon. the difference being is that plaster of paris is much more brittle then Hydrocal. But in my honest opinion you cut down on the bubbles. I would be interested in others experience with hydrocal. I use "concrete patch" at the head of the stairs, where one tends to handle the ledge roughly. You need to use water at temperatures between 70 and 100 Fahrenheit. You should be fine. Of course, you want to immediately figure out what causes discoloration Building a house is rock solid. Shake the bubbles out and level of the castings. I suppose this would be determined by the size of the dry grains. I'm also a hydrocal fan for plaster casting. Is there any difference between hydrocal and plaster of Paris? On the other hand, if you do not want the plaster to be a little wet so that you can easily clean it up after demolding, you can take it out as soon as it does not dent or get squished when you scrape it with a toothpick or a metal pin. Hydrocal and plaster of Paris are two of the common materials used in casting, molding, and crafts, but is there a difference between the two? The pictures below are of a Hydrocal High Arched PRR prototype stone viaduct that I've been working on the past week or so. Aside from that, it also takes a lot more detail. Hardens like a rock quickly. It's just more expensive than Ultracal, and lacks a few additives. It's a slower method and takes longer to set up, but I like the results. Thank you for reading! This supplier may also carry masonry supplies. However, there are instances wherein you do not want the plaster to completely dry out before it is removed from the mold. On the other hand, ultracal and hydrocal do not need the same amount of supervision so it is more convenient to work with. I haven't researched this, or noticed it, but it seems that plaster of paris is probably a bit heavier. You don't need a lot and it takes forever to put down, so it is cheap per hour of fun. Regardless of how hard to try to create a strong and hard cast from the plaster of Paris, it is still plaster that is brittle and vulnerable to breakage. I had to chisel some off the sides to remove the cast. I use shellac for this purpose. Step 6: Allow the hydrocal to dry. It is ideal that you wait at least a week. but I dont think they are woodland scenics.but it seems to work fine. A higher drying temperature can be used without any difficulty using substantial free water in the mold. This is to make sure that the slurry evenly flows across the surface of the mold. Hydrocal is also compatible with many color pigments. If you are wondering how hydrocal is used to create casts, you can check out the video below for the process. my photos. Generally, the maximum temperature at Ultracal molds can be heated safely is 120 Fahrenheit. link to Why is My Well Water Brown All of a Sudden? Crystals are formed in the mixture of water and calcium sulfate during the setting reaction which makes the plaster harden. Many good LHS's will buy the bulk bags and re-package it themselves into smaller bags. Hydrocal White is versatile gypsum cement that is an excellent choice for making solid and hollow castings. It is enough that Jesus died and that he died for me. I will fill coffee cans and place in quart size plastic bags. While we strive to provide quality information, we cannot guarantee its accuracy. They can be set at about 25 to 35 minutes. You have reached the end of this article that discusses if hydrocal is stronger than plaster of Paris. Plaster of Paris (Hilton?) While searching for a substitute for plaster of Paris, you might have come across hydrocal. I. link to Should You Leave Your Shower Curtain Open or Closed? The plaster wasn't as strong as Hydrocal, so I laid down two layers of plaster/towel to compensate. I noticed how thin, light and how strong the casting was. Leaving the shower curtain open or closed has long been a debate for a lot of people. The main use of hydrocal is casting sculptures and making molds for arts and crafts. This is the plaster that is used for skim coating blue board. Hydrocal is my preference for molded outcrops, since it is tough. For a mold that will cast 5 or 6 pieces? But, Jeffrey, would that not make the plaster essentially impossible to paint? You can use white glue, white flour, or Paris powder as a substitute for plaster. I wanted its superior strength. You need to mix the plaster carefully to avoid adding air. Like Jeff, I also userigid closed cell insulation for cast forms. Mix them until the glue is thoroughly dissolved in water. You can post now and register later. Bob Hahn. Step 2: Let it soak for about two minutes then stir for one minute. I think with any new medium for casting there is a learning curve, and a comfort factoryou shouldn't expect success on the first pour. What is the difference with Plaste of paris? I buy it 500 pounds at a time for my business. Make sure that you read and follow the handling and directions on how to use hydrocal according to what is written in the package. But it is awfully good for rock castings. One slight side note: after you are done with your casting.. go back to your mold.. and wash it off.. with water. Then I knew.. What is hydrocal? For a more in-depth discussion about this topic, you can check out this article that we have shared titled, what is hydrocal? It is considered the strongest and hardest gypsum cement available. Hydrocal is versatile gypsum cement that is used for hollow and solid castings. I used Hydrocal White for many years with no seriouscomplaints, but more recently have been using a product called Tecstone (It's a dental plaster). Follow the instructions on the label on how to mix the hydrocal. After I was done.. Paste as plain text instead, It is also more convenient that you clean as you go because it makes the process easier. It is also a quick setting which is ideal for arts and crafts. Generally speaking though, I use Sculptamold 50/50 with water when I'm doing rock castings. The process of heating the powder is called calcining. I have a box of hydorcal, but haven't used any as yet. Once you have measured the ingredients, you need to soak them. Mix the glue to the water and plaster mixture. Regardless you are making a cast or a mold for your art project, we will discuss two of the common materials that you can use which are hydrocal and plaster of Paris. What has taken place.. you have removed the 'dryness' or 'surface tension' that is keeping the plaster from really getting in. I use less plaster.. pour a thinner mold.. and is light.. but strong. 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. The next step is mixing. We have also shared this article thatdiscusses what happens if plaster of Paris gets wet. Add cup of white glue into the water. link to Should You Leave Your Shower Curtain Open or Closed? What is the Difference between Hydrocal and Plaster of Paris? Do not worry much because it will eventually combine into the mixture. As compared to plaster of Paris, hydrocal takes a lot more details and they do not slough off so you do not have to deal with lots of dust and chips. It is made for thin sections and is also more durable so there is minimal breakage during mold removal. Ultracal is stringer and harder as compared to hydrocal. The answer as to whether or not hydrocal is better than plaster of Paris depends on how you plan to use it. 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. . Just my opinionTim. This website is strictly for entertainment purposes. I used the finer plaster of paris for rock castings. Thanks, Rich. In the video, how to mix and use ultracal is discussed. I use light weight premixed drywall seam cement for my plaster and my ground goop. Check out the article for more information about the topic. 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. Besides.. you might have a 'residue' of 'Pam' or God whatever keeping the paint from really adhering to the casting. Hydrocal provides twice the compressive strength of plaster and is ideal for thin and delicate sections where high green strength is needed. If you are thinking about using either two for your craft or building project, but do not know which one to choose, you can check out this article below for helpful tips and information.

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