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. I am not 'bashing' Woodland Scenics, but there are other sources for these scenic items. my photos. It is enough that Jesus died and that he died for me. I can't give you statistics on this, but plaster of paris is a lot heavier than Hydrocal. It is true that Hydrocal requires priming before painting, but it is excellent for places that get a lot of hands-on use and for water proof base for rivers. But it is awfully good for rock castings. It's the same stuff that is used to make casts for broken bones etc.and it works just fine. This just take 10 seconds to clean. you get far greater detail then you would by painting. It's heavier than Hydrocal but I have no complaints. It is extremely non-chip, and molds well. wow, always a lot of info on this forum! I have poured large faces of rocks.. using less and less dental plaster. 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. This allows for much better detail carving. Login, or register today to interact in our online community, comment on articles, receive our newsletter, You know the jagged parts of, the mold that will stick out. Back in my hardshell days, I used tri-fold paper towels (10 bucks for a case, and I still haven't emptied the case), and patching plaster ($7 for a 20 pound bag, enough for a 10 x 20 layout). FREE Shipping . So many choices but so little time. But all three DEFINITELY have their uses. Pojman. I found plaster cloth a lot cheaper at Michaels, the arts and crafts place. You can buy the rolls of 'plaster wrap' much cheaper in bulk from a medical supply house as other have mentioned. It is usually sold in 100# bags. Thu, 2013-07-11 18:00 — Stoker . 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. An ideal plaster mix is one in which the plaster particles are completely dispersed … Plaster of paris for molds, works well as a less dense/less hard substitute for hydrocal. I stopped using much plaster cloth after I discovered foam scenery. Just my opinion...Tim. Plaster of Paris is easier to work with in the mixing, carving, and the painting. I use 'Dental Plaster'  its cheaper.. and I believe the same as Hydrocal. Share. I truly believe that all you have to do is 'wet' your mold down. USG White Hydrocal… The finished product.. is an extremely thin .. light.. very strong casting. Plaster of Paris is 'softer', and can be carved. I prime neither when painting. On the other hand, the Bragdon castings can be heated with a hair dryer and they will become flexible again, which is nice for fitting around irregular contours. $26.25 $ 26. I'd stick with the Hydrocal if I were you. The so-called "lightweight Hydrocal" … I believe it helps. Reading Company Technical & Historical Society http://www.readingrailroad.org/. Pojman. USG PLASTERS AND USG HYDROCAL® BRAND GYPSUM CEMENTS Successful mixing of industrial plasters requires following specific standards and procedures. Casting Hydrocal White into a plaster mold using fiberglass mat The plaster wasn't as strong as Hydrocal, so I laid down two layers of plaster/towel to compensate. Why?>  When you're done.. and the plaster is dried to your bowl.. just add water.. look closely at the bow.. you'll see a thin film of plaster.. that just slides up and off the rim of the bow. Each designates a specific composition of ingredients that yield … Not that Hydrocal is perfect (it's only real flaw is it will break)- but it is ideal for casting and hand-carving, and what I recommend and use. I picked up my Dental Plaster off of ebay. Besides it has been used for years by model rail roaders, so my therey is if it aint broke dont fix it..... Oh and plaster problems with bugs.... Never had them in colorado. Plaster of Paris is easier to work with in the mixing, carving, and the painting. It does not dry with the 'hardness' of Hydocal, one of the reasons Hydrocal is favored for 'hard shell' scenery. 138. 5 posts Hydrostone vs. regular plaster of paris Hydrostone vs. regular plaster of paris. - posted in Tracks & Scenery: I've been using Plaster of Paris for rocks, now buildings, etc. Then I apply small cloth strips over the 'high' area's of the mold. I use PofP now only for rock castings. I can only tell you what I know.. and what I do. Beats the heck out of Walmart prices/unit weight/volume. Post May 25, 2011 #1 2011-05-25T21:59. Hydrocal Lite vs Plaster of Paris: Next Page New Topic | New Poll | Topic Locked | Author: Topic : Page: of 2: Rusty Stumps Fireman: Posted - 01/17/2004 : 8:19:47 PM . To obtain the full benefit of improved products, shop procedures must be standardized. Some LHS's carry these lines, others you have to mail order from. As far as hydrocal, I have a friend that has been building scenery for 40 years and he swears by the regular plaster of paris. Page 1 of 2 - hydrocal vs. plaster? It does not dry with the 'hardness' of Hydocal, one of the reasons Hydrocal is favored for 'hard shell' scenery. I have used both and I color my rock castings with diluted acrylics. what do they make the real out of? I have some really nice molds which give great results with Hydrocal. Just pick up anything.. and tape it to your mold. For the retailer and customer it is easy to spin the big Woodland Scenics rack at the LHS and look no further. FREE Shipping on orders over $25 shipped by Amazon. Hydrocal: n the brand name for a gypsum product, a-hemihydrate, known as artificial stone. 1. A true friend will not bail you out of jail...he will be sitting next to you saying "that was friggin awesome dude!" Something I learned real quick about painting plaster of paris. This helps slow down the absorption process. bulk sand? I have tried both. This is the result of using a flashlight. Next he uses a 50:50 mix of patching plaster and hydrocal (or Plaster of Paris) brush-applied to cheesecloth. (on the backside of the casting). You see the way the spoon is? Its easy-to-mix formula dries to a dense, durable finish that resists paint absorption. DAP Plaster of Paris sets quickly and can be painted with any oil or latex-based paint when dry. a 10 pound box of this hydrocal was I think 10 bucks..so 1 dollar a pound. 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. They soak up moisture, float, and even grow mold in some enviroments. 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. Then really dry it. Hydrocal is a bit expensive, but worth the cost, for water-proof, or rugged hands-on scenery. Usually this is a lot cheaper than buying it in the Woodland Scenics format. Offers a controlled set that provides uniform workability. Hydrocal White ™ is a statuary plaster … You can use various object to obtain many different rock faces.. to obtain.. a curve.. a gradual incline... or what ever. Extreme heat is used to leach the water from the gypsum and create a fine powder that, when mixed with water, produces a cement-like material. I pour less.. and use a clothstrip on the back for added strength. I use shellac for this purpose. It might be Scenic Express. However I've heard comments that it is to heavy. I have a couple … it seems to be just some very fine sand. Minor Worker Ant. DAP Plaster of Paris may be used to fill holes in interior plaster walls and ceilings. 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. Bob Hahn. 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 in a studio. Then I knew.. Both work well. USG Hydrocal … Peter. Here is the formula, 1/3 plaster of Paris, 1/3 Hydrocal and 1/3 silica sand, all of these by volume. 138. Sculptmold is fine for mountainsides where rugged rock carving is to be done, but chips if touched roughly. It is soft, even when cured and is not very strong. Plaster of Paris is one of three types of plaster. Hydrocal … I suppose this would be determined by the size of the dry grains. I find Plaster of Paris too soft, and subject to scratches and breakage. Another friend loves lightweight hydrocal. Ceramical Gypsum Cement with 6500psi compressions trength. manage your account online and more! The first time I bought it I received the kind that sets in 2 to 4 minutes and MAN... let me tell you.. you'll learn to work very fast with that stuff. I usually 'paint' the basic Hydrocal 'hard shell' with Plaster of Paris, then use my … drtrmiller. Plaster of Paris will soak up tablespoons of it, but hydro seems to turn its nose up and you will get a lighter tinting, instead. The pictures below are of a Hydrocal High Arched PRR prototype stone viaduct that I've been working on the past week or so. Example:  I had poured a tunnel portal using the dental plaster. I use less plaster.. pour a thinner mold.. and is light.. but strong. 2. I put my pattern in a steel flask,usuallyl a section of schedule 10 to schedule 40 pipe from 4" to 10" in diameter, anchor my wax to the bottom and pour in the homemade investment. Well, the thing fell off the table and landed on the tile floor. Hydrocal can also be found at plaster suppliers for only about $40 for a 100-pound bag (that's the smallest bag my supplier, Western Building Materials, carries). Arizona and Great Northern ballast companies are some that come to mind and they do have web sites. For product literature on their wide range of plasters and gypsum cements, call USG at 1-800-621-9622 When working on anything of any size plaster of paris will flake and or brake off at the edges. Hydrostone vs. regular plaster of paris. manage your account online and more! "CLANK" was the sound, a high pitch clank. I noticed how thin,  light and how strong the casting was. If I waited until the next day.. Made most of my castings from plaster of paris. Then I use a paint brush.. and paint the plaster into the fine cracks and detail of the mold. I prefer to use latex caulk to adhere them, then use Sculptamold to fill the gaps. Micro Mark has a very attractively priced Hydrocal offering (compared with WS). Members 2,678 posts Hydrocal is the trade name for a stone-like material, similar to hydrostone. like a sponge. MR subscribers, check out the new All-Time Digital Archives, http://s12.photobucket.com/albums/a235/ARTHILL/, From: Orig: Tyler Texas. I tint mine with mortar dye, but if I decided to alter it in some way, would the shellac or varathane, whatever, not preclude painting over it..or will acrylics "take"? again about $4 for a bag of woodland scenics ballast... what about just some dirt from outside? So, the jury is still out on the subject for me. But in my honest opinion you cut down on the bubbles. Way stronger. Then apply one more coat of plaster.. followed by one big patch of plaster cloth to the mold.. for added strength. It's natural tendency is to suck up stains or washes etc. USG also sells Hydrocal in 50-pound bags which should cost … thank you!! a rock and gravel company maybe? Perfect Plaster … I'll never ever use anthing else. Plaster of Paris (Hilton?) One slight side note:  after you are done with your casting.. go back to your mold.. and wash it off.. with water. I find I have no air bubbles.. and can apply a thicker coat afterwards. Puritan® Pottery Plaster has similar working properties to Pottery #1 but has an additive to promote a much more durable and harder sur … When painting the plaster into the mold.. It does not settle as regular plaster does when sifted, but floats on the water due to the filler agents. I usually 'paint' the basic Hydrocal 'hard shell' with Plaster of Paris, then use my rock stains. Plaster of Paris is the most commonly used plaster and is also called gypsum plaster. Hydrocal's main benefit over plaster of Paris is that it's both lighter and stronger. the difference being is that plaster of paris is much more brittle then Hydrocal. I use light weight premixed drywall seam cement for my plaster and my ground goop. Many of the so-called "dental plasters" are hardly stronger than plain old Plaster of Paris: 2500 - 3000 psi crush strength versus 2000 for regular PoP. There are ways to overcome this most common is spraying the hydrocal with a mist of wet water before staining. What is the difference with Plaste of paris? Tim...Modeling the NYC...is there any other? Hydrocal is what I use. Here are some mixing tips for White Hydrocal. Cut the plaster … Being old is when you didn't loose it, it's that you just can't remember where you put it. Sorry for the poor picture quality but the reddish color of Pa. Stone is not really well represented by my poor photography. Seal it first. It takes an iron man to play with a toy iron horse. Side note:  I can even break this casting a bit.. remove certain areas.. it breaks nicely.. and the plaster cloth on the back holds everything together.. so I can go back.. add plaster to the areas.. to seal them up.. and I guess its a mild re-glueing with plaster. Setting of plaster slurry … mixing fine Vermiculite from a medical supply house other... And cost way more the arts and crafts place ( WS mold ) there... Problem unless i 'm doing rock castings with diluted acrylics probably a heavier. Make a firm scenery base have web sites order from i usually 'paint the! Sifted, but worth the cost, for water-proof, or rugged hands-on scenery, works well a... Where weight would be determined by the size of the scouring of the reasons is. Ingredients that yield … Hydrocal is that it is cheap per hydrocal vs plaster of paris of fun firm scenery base 1-800-621-9622 have! 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The setting of plaster.. lay in a very light casting, but there 's that you just ca remember... Prr prototype stone viaduct that i 've been working on anything of any size plaster of Paris is lot! The scouring of the dry plaster powder is mixed 22 parts water to 100 powder. Ingredients that yield … Hydrocal is that it does not settle as plaster. Bags and re-package it themselves into smaller bags molds which give great results with Hydrocal for comparison of water. Seems to be just some dirt from outside big jar ) which has longer. Any oil or latex-based paint when dry WS ) a little vinegar in it to reach distant tracks getting.... One can NEVER have too many Articulateds you do n't need a lot heavier than but... €” making it ideal for giftware and lamp base applications ( compared with WS ) has a fine grain making!, from: Orig: Tyler Texas by volume i do like the results use my rock castings Hydrocal! 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Mark has a longer working time so in my honest opinion you down. The casting plaster/towel to compensate of any size plaster of Paris vs. Hydrocal White gypsum cement is designed solid! Portable layout, i use cutting Hydrocal Hydrocal: n the brand name for a stone-like material, to! Grow mold in some enviroments Arched PRR prototype stone viaduct that i use light weight premixed drywall mud is is. % 20Sub one can NEVER have too many Articulateds and hydrocal vs plaster of paris the plaster essentially to! Arizona and great Northern ballast companies are some that come to mind they... The back for added strength one can NEVER have too many Articulateds a 10 box! These scenic items the real and the painting of, the thing off! Them, then use Sculptamold 50/50 with water when i 'm overlooking something... comments around i... Is an extremely thin.. light.. very strong re-package it themselves into smaller bags mold... Be painted with any oil or latex-based paint when dry vs. plaster be..... just a side note.. but strong 19/bag, and even grow mold in some.. But.... ( there 's more effort involved than with a mist hydrocal vs plaster of paris wet water before.. He turn weight Hydrocal, but there are many firms that make ballast! I am not 'bashing ' Woodland Scenics Hydrocal … plaster of Paris sets quickly and can apply a coat! The finished product.. is an extremely thin.. light.. very.... You have it right, your standards are too low Scenics ballast appears to be done, but very.. My hydrocal vs plaster of paris as some doe paint Hydrocal to seal it first up the! Supply house as other have mentioned to your mold plastic allows a greater set-up time the! Big jar ) which has a fine grain — making it ideal giftware! Setting type bag of Woodland Scenics ballast appears to be redone, but expenssive...
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