Then I make my castings out of plaster from Home Depot. For regular drywall mud it doesn't matter but I get better, smoother product adding powder to the water but if you use premix you are adding water to the mud if you thin it so obviously it doesn't matter. Hydrocal is a gypsum plaster. If it doesn't, toss it out and start over. Thanks for any help. MR subscribers, check out the new All-Time Digital Archives, https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=dental+plaster+hydrocal&_sacat=0&LH_TitleDesc=0&_sop=15&_odkw=dental+plaster&_osacat=0. This is a good suggestion, as the plyood will readily absorb water from the hydrocal, weakening the finished product. it may improve the thoroughness of hydration to mix under vacuum if the powder does not readily 'wet'. It sounds like your mix ratio was incorrect. I don't think I have ever actually used the Woodland Scenics branded hydrocal plaster. Shelf life is 6 months according to US Gypsum. If you tell them US Gypsum's the supplier, they can usually figure out where to get it from, and are most helpful doing it. Hydrocal involves both chemistries so best results are achieved by following the manufacturers mixing directions as precisely as you can. Another thing to ask for is hotmud. Are hydrocal and plaster exactly the same thing? It eventually turned into a solid block of plaster.I looked at a dental supply website. There is a reason you should add the water to the cement. https://www.usg.com/content/dam/USG_Marketing_Communications/united_states/product_promotional_materials/finished_assets/usg-hydrocal-B-11-gypsum-cement-southard-submittal-en-IG1391.pdf. Follow the stuff Henry has in Glassnotes. Hydrocal White 8 Lb Pail (220064) A good general use product that offers a gradual setting time and a long period of plasticity. amykins3. Sets fast in 20-30 minutes without shrinking. If you are wondering if the batch is setting up - its not. I got mine from a building supply outlet. It should get warm to the touch and set solid as a rock. Made in The USA. It is a sealer rather than a coating. Member since January 2004; From: Crosby, Texas; 3,660 posts Posted by cwclark on Wednesday, January … Mixing fine Vermiculite from a garden supply with plaster of Paris or Hydrocal is also another solution. Post Nov 02, 2014 #1 2014-11-02T16:18. so I just moved to Portland, and ive located a source for dental stone that is pretty reasonable. Then it is easy to turn out the set plaster into the trash (actually I add it to the compost pile) and the bowl is ready for the next use. Woodland Scenic markets a light version which presumably is cut with a lightweight filler of some kind. I don’t buy Hobby Hydrocal, too much $$$. It is possible, in a nonstructural application, to reconstitute a hard shell on effloresced plaster by making a solution with a little 'water wetter' and acrylic mortar additive, and wetting the surface a couple of times till it will 'take' no more solution quickly. 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. You could also add a bit of water to stuff that was just starting to be less workable but there were limits. Hydrocal Plaster for Scenery, Dioramas, Dentistry and Mold Casting Plaster Resealable Bag Great for Model Railroads (10 Pounds) Woodland Scenics Woo Lightweight Hydrocal C1201 Wooc1201. Reply; Edit; cwclark. USG Hydro-Stone® Gypsum Cement 25 lbs. For resin based "water" you do want to completely seal the entire " bowl" you intend to fill with resin. Hydrocal Plaster for Scenery, Dioramas, Dentistry and Mold Casting 5 lb Pack Resealable Bag Great for Model Railroads by Capital Ceramics. Got two 100 # bags for $25 each, but this was about 25 years sgo. He said it chipped easily if you did not "seal" it, before painting. For general wall and ceiling repair. Is there an easier and cheaper way to buy a quantity of it than one carton at a time off the hobby shelf? That is to say the stuff you first add water to will be reacting long before the last bit. In the past, I've used both hydrocal and dental plaster, both obtained through a building supply outlet, but when they suggested I try Durabond, I found it to be perfect for my needs. I've never bought hobby plaster products, as they're usually over-priced. Recommended for solid and hollow casting of lamp bases and figurines. Most people seem to have the tendency to do the opposite. He told me why  but of course I've forgotten. "Hydrocal"is a brand name of a plaster made by U.S.Gypsum (supplier). The patching plastic allows a greater set-up time for the hydrocal and permits better control of forming the scenery profile. The USG article encourages one to use exact measurements, temperatures and technique. This making process has me veering into all the interesting possibilities and combining it with other mold making processes such as ice molds sounded like fun. Just used regular plaster I bought 5 years ago and no problems, again properly sealed. I use good old Plaster of Paris, purchased from Lowes - $12 for 50 lb bag. I bought a large paper bag of Hydrocal from a hobby shop in the mid-1990s when I was working on my HO scale layout, which I tranferred into a large Ziploc freezer bag with the air squeezed out every time I sealed it.Would you know, that same bag of Hydrocal is still in use today, over 25 years later, for making rock mold castings for my N scale layout! Hydrocal Plaster - Regular Set - Scenery Plaster - Model Railroad - 38 lb Box - Model Stone for Dental Laboratory and Dental Office from Manufacturer! The TL:DR divorced from the chest-beating and implied repute, etc., is to carefully apportion the water and powder -- I'd recommend doing it by weight, rather than volume, just as with some epoxy systems -- and mix them thoroughly ASAP. One of the most important things with plaster is to use fresh plaster. 52. Is there an acceptable substitute that I may find at my local hardware store ( Lowes or Home Depot)? Not sure how it might price out as compared to plaster cloth. bag of it. I found an old thread where Jeffrey (who has passed and now the Diner carries his name) was a fan a regular plaster. It sat stored in those containers you get cat food from with the screw on lid. than with even typical pumped-to-place mixes. I am having difficulty finding Hydrocal in bulk (ie. How is the best way to do that? It is designed for thin layers of extra hard surface. It doesn't "set". The link that lastspikemike posted had some interesting data but perhaps not important to us. You have to register to see price, which I did not do, but they have 25, 33 and 50 pound boxes. A Class A line located in a personal fantasy world of semi-plausible nonsense on Tuesday, August 3rd, 1954. May 10, 2006 #7 One trade name for hydrocal is Fixall. All of the above is from my experience mixing literally hundreds of batches of plaster over the years for my hardshell and rockwork. I went to the USG website and there is no dealer locator for Canada. I have broken a few rules I am sure with my molding and it all seems to work out but then I always worked in smaller batches. 3. I had one container of Hydrocal go bad after a couple of years. Hydrocal is formulated to provide a much higher surface strength than "plaster of Paris". I'm working on a small stream for my HO layout, and it's my first time attempting water. USG has 12 versions of hydrocal and they don't list the density for all the versions. The instructions on the USG site give the mixing ratios by weight. FRED. There are a couple of colors- white, grey, Ultracal (even HARDER), etc. Drywall mud is just mud, no chemistry. If the original mix was too dry then this may seal the surface, if you're concerned about strength you could just overlay the hydrocal with a sheet of plaster cloth. Isn't plaster of paris hard enough? $ 27.50: Add to cart. If they sell bags of stucco, that's the right place. amykins3. Hydrocal is far stronger than we need so as long as the stuff you mix works  then fine. I usually get mine in large (50# or 100#) bags from a local building supply (lumber, hardware, etc.) Most likely the plaster is bad. And, yes, proportions of water to powder are important if you want a strong and consistent product. It comes in sizes from a pint to 25 lbs. Shellac is a poor product to use for non porous surfaces. I recommend buying new plaster at a plaster and lathe supply company. However, at my ceramics supply company that I order from I see that they have a number of different types of plaster: Plaster, Hydrocal White with 4500psi compression strength. If you use drywall mud it's best to use thin layers and build them up. Login, or register today to interact in our online community, comment on articles, receive our newsletter, It';s a LOT harder than normal plaster- which is why they use it for hardshell. If you know what you're doing you could do it the other way around but if you did know then you wouldn't. if stopped by the police simply tell them that after sharing the white powder you are going home to finish a reefer. Shipping 50 lb bags of Hydrocal would cost big money, maybe more than the purchase price. manage your account online and more! Then I paint and finally add the Envirotex. I live in Montana and things can be a lor harder to find up here. If you want plaster for molds, go preferably to a pottery supply unless your local hardware store has Hydrocal (Brand name) which is a somewhat tougher plaster at higher temperatures. If it's just the drying mud kind with no chemical reaction "setting it up" it really doesn't matter how the powder gets wet. I attempted using WS lightweight Hydrocal this week, but I had opened the container last summer (2019). It was fine, hard and durable. For very small batches it's easier to judge the required quantity of powder and add the water "to taste". Hydrocal is one form of plaster. yard. how delicate then must skin be — Corinne Chase. 5.0 out of 5 stars 4 $49.99$49.99 Bag : USG White Hydrocal 50 Lbs. Predator Costumes and Props I need to get a order off to WS or Scenic place for weeds for RRC. I never experienced the chalkiness you describe. Woodland Scenics says you need to remix the light stuff, dry, before you add it to the water. Never a problem. Take a look on US Gypsum's website. E-mail: Password: Sign In. Soooooo......take that for what it's worth. The water ratio is not critical but it must be close - trial and error works fine in establishing the wet to dry ratio - once you find the amounts use the same each time. To control setting time, I use baking powder. You can always resort to buying Scenic Express' Gypsolite from MTS or other hobby suppliers, but you'll be paying a premium ($11.98 for a one-gallon bottle from MTS vs. $11.30 for a 50-pound bag from Home Depot). It works very well as an adherent layer on porous surfaces you want to paint or coat with a product that creates a film on the finished surface. They also have other versions of artistic plasters. DAP Plaster of Paris can also be used for mold making, casting sculpted figures, and hobby and craft applications. I was always told to mix hydrocal to a peanut butter consistency. Tinting each layer with a bit of acrylic craft paint, dark at the lower level and getting lighter, will make a better water effect. White Plaster of Paris Dry Mix that features an easy-to-mix, fast-setting formula that can be sanded and painted for customized use. Its easy-to-mix formula dries to a dense, durable finish that resists paint absorption. I had been storing the container in a bucket in a (dry) basement, but the carton wasn't sealed in any way other than being closed. MR subscribers, check out the new All-Time Digital Archives. The water/powder ratio of hydrocal is critical, much less forgiving than plaster of paris. I'm going to go out on a limb here … Registered User. I think I've used white glue to help seal it, too. Worked for British Gypsum for 25 years. It is Hydrocal or and equivalent. Old club I used to belong to bought it by the drum, and when it closed they let everyone load up from an almost full 55 gal container. 4. Don . (used mainly for rock-castings). The "secret" ingredient in hydrocal is exactiy the right amount of Portland cement, you will know that stuff as concrete. USG Hydrocal (gypsum cement): $40 for 100 lbs. Offering twice the compressive strength of plaster, Hydrocal® White Gypsum Cement is especially suitable in thin, delicate sections where high green strength is required. This comes in rolls like paper drywall tape, patches and there's an aluminum sheet product for any high strength areas. For plaster of paris, hydrocal or Portland cement products it does make a difference. Lynn Westcott said that it is the plaster that makes alabaster. I had a 10+ year old box of it, opened back then too, and used the rest of the box to craft a couple of rock faces two years ago. I was always told to mix hydrocal to a peanut butter consistency. Hydrocal™ FGR-95 Gypsum Cement. B. BLVDBUZZARD New Member. New Customer? Usually aggregate is added first, then cement, then water. 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