Many good LHS's will buy the bulk bags and re-package it themselves into smaller bags. http://s299.photobucket.com/albums/mm310/TWhite-014/Rio%20Grande%20Yuba%20River%20Sub One can NEVER have too many Articulateds! Offers a controlled set that provides uniform workability. Yeah, Jeffrey, that makes sense. I believe it helps. CUTTING HYDROCAL When working on anything of any size plaster of paris will flake and or brake off at the edges. When painting the plaster into the mold.. You can use various object to obtain many different rock faces.. to obtain.. a curve.. a gradual incline... or what ever. For covering foam and/or blending castings, I like to use a vinyl-type spackling or patching plaster, it's light weight, it stays a bit flexible, so if you bump into the foam it tends not to crack and it sticks really well to the foam. I dont' think that is my approach. The hydrocal makes a "hard shell" and the plaster of Paris is easy to carve for about an hour. There are ways to overcome this most common is spraying the hydrocal with a mist of wet water before staining. But in answer to your question.. I also use Gypsolite (LHS, same big jar) which has a nice gritty texture. To obtain the full benefit of improved products, shop procedures must be standardized. Reading Company Technical & Historical Society http://www.readingrailroad.org/. Both work well. Of course this is the backside.. but its to show you how thin. Ultracal, Plaster of Paris and the dozens of other plasters and gypsum cements all have their advantages and disadvantages. If you think you have it right, your standards are too low. 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. is this normal? manage your account online and more! USG White Hydrocal… Ceramical Gypsum Cement with 6500psi compressions trength. (on the backside of the casting). Mabye in more humid climates though. It is extremely non-chip, and molds well. Then I use a paint brush.. and paint the plaster into the fine cracks and detail of the mold. But in my honest opinion you cut down on the bubbles. 'Surface Tension'  yes.. that is what is keeping the plaster really getting into and adhering to the mold. It is soft, even when cured and is not very strong. Densite is the name. The name Plaster of Paris first came about in Paris, where there is a … It would do so after priming. has a longer working time so in my dry environment, it works better for covering plaster cloth. Another friend loves lightweight hydrocal. With that overview, let's look at the basics. Ballast - Most of the Woodland Scenics ballast appears to be crushed walnut shells(or something close). Besides.. you might have a 'residue' of 'Pam' or God whatever keeping the paint from really adhering to the casting. MR subscribers, check out the new All-Time Digital Archives, http://s299.photobucket.com/albums/mm310/TWhite-014/Rio%20Grande%20Yuba%20River%20Sub. The setting of plaster slurry … I find Hydrocal is better for making rock castings. Bob Hahn. Its easy-to-mix formula dries to a dense, durable finish that resists paint absorption. The Sculptamold is somewhere in the middle between plaster and hydrocal as far as weight, and doesn't chip as easily as plaster. Example:  I had poured a tunnel portal using the dental plaster. It is enough that Jesus died and that he died for me. Hydrocal is my preference for molded outcrops, since it is tough. For product literature on their wide range of plasters and gypsum cements, call USG at 1-800-621-9622 It cures slower and is no where near as strong as Hydrocal White ™. Take a Ride on the Reading with the: I would still use real ballast. 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. I used latex rubber bands to hold the mold around the flashlight. Hydrocal comes in several versions(Hydrocal/Ultracal/etc...). Cycling. So plaster is a category that contains Hydrocal, Plaster of Paris, etc... Back to top #3 Offline drtrmiller - Posted June 7 2017 - 4:16 PM. Just pick up anything.. and tape it to your mold. This gave very nice results, too. I use 'Dental Plaster'  its cheaper.. and I believe the same as Hydrocal. This allows for much better detail carving. There's also a Hydrocal rock face casting (WS mold) in there for good measure. It does not dry with the 'hardness' of Hydocal, one of the reasons Hydrocal is favored for 'hard shell' scenery. FREE Shipping . 1. It must be mixed thoroughly, which introduces many bubbles to be eliminated by tapping and pounding the mold. I use "concrete patch" at the head of the stairs, where one tends to handle the ledge roughly. a 10 pound box of this hydrocal was I think 10 bucks..so 1 dollar a pound. Well mix your plaster exactly like this. Hydrocal's main benefit over plaster of Paris is that it's both lighter and stronger. a rock and gravel company maybe? So, I stuck with using Plaster of Paris. Plaster of Paris is 'softer', and can be carved. Even though your plaster mix has been mixed correctly with no bubbles.. you can and will still get an impartial filling of the cracks and detail. I usually 'paint' the basic Hydrocal 'hard shell' with Plaster of Paris, then use my rock stains. Is that about right? They soak up moisture, float, and even grow mold in some enviroments. I did use Sculptamold for a couple of large castings for large, curved … Casting plaster, including Plaster of Paris, is made from calcium sulfate that is derived from gypsum. I stopped using much plaster cloth after I discovered foam scenery. So far, it is strong. I buy somebody else's Hydrocal in a big jar. Login, or register today to interact in our online community, comment on articles, receive our newsletter, I used the finer plaster of paris for rock castings. I pour less.. and use a clothstrip on the back for added strength. 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. 138. Real rock ballast is much better. Perfect Plaster … 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. A true friend will not bail you out of jail...he will be sitting next to you saying "that was friggin awesome dude!" Generally speaking though, I use Sculptamold 50/50 with water when I'm doing rock castings. 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. Vendor. 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. Good luck. Thats it.. btw.. What has taken place.. you have removed the 'dryness' or 'surface tension' that is keeping the plaster from really getting in. It would do so after priming. Micro Mark has a very attractively priced Hydrocal offering (compared with WS). I have already commited about $2500 on wood for this train set, 2 loomotives, some cars, construction insulating foam, paints, paint brushes track, power supplies heheh...why am I telling you all this, you all know how it works...   well my wad of cash is gone so im now ready to do things the cheapest way. it seems to be just some very fine sand. Bugs love plaster of paris. 2. I have poured large faces of rocks.. using less and less dental plaster. So, the jury is still out on the subject for me. Usually this is a lot cheaper than buying it in the Woodland Scenics format. I am not 'bashing' Woodland Scenics, but there are other sources for these scenic items. They just re-package the same materials you can buy elseware in bulk. Share. There is aTuf-stone which is much harder … This is a quick shot I took of some under-construction scenery, which is mostly just pink foam covered with Gypsolite with embedded brown paint. Then apply one more coat of plaster.. followed by one big patch of plaster cloth to the mold.. for added strength. This helps slow down the absorption process. It's the same stuff that is used to make casts for broken bones etc.and it works just fine. it seems I go to the hobby shop...buy a crap load of stuff...and in about 2 hours im out of supplies! Plaster of Paris vs. Hydrocal White ™ Plaster of Paris is a cheap plaster. Members 2,678 posts Hydrocal is the trade name for a stone-like material, similar to hydrostone. 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. DAP Plaster of Paris can also be used for mold making, casting … USG No. I truly believe that all you have to do is 'wet' your mold down. The so-called "lightweight Hydrocal" … Light and strong. I seal the bottom of the pipe with dry plaster of Paris … However, instead of Hydrocal, I use a dental-stone type IV plaster for pouring rock castings, which is the second-hardest type of plaster available (type V is harder, but type IV is best for our applications). It's natural tendency is to suck up stains or washes etc. 138. hydrocal plaster of paris–but not alone! I have tried both. MR subscribers, check out the new All-Time Digital Archives, http://s12.photobucket.com/albums/a235/ARTHILL/, From: Orig: Tyler Texas. It is usually sold in 100# bags. An ideal plaster mix is one in which the plaster particles are completely dispersed … When the dry plaster powder is mixed with water, it rehydrates over time into gypsum. When hardened, it will permit removal of molds with "undercuts" whereas plaster of paris will break off detail. But in short... using the hyrdrocal/dental plaster. 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). 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. I suppose this would be determined by the size of the dry grains. 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. Strictly my O/P  as some doe paint hydrocal to seal it first. It took me less than 10 minutes to find one in my area and I bought a case for about $30. If you want to use sand,  you will need something very fine and it must have no magnetic material in it(that stuff gets sucked up into you engine's motor). Falling in Art 5lb Plaster of Paris. 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. what do they make the real out of? I know this.. Here are some mixing tips for White Hydrocal. I am happy with the detail.. and this is the best shot I can show you. 5 posts Hydrostone vs. regular plaster of paris Hydrostone vs. regular plaster of paris. Hydrostone vs. regular plaster of paris. 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. You can buy the rolls of 'plaster wrap' much cheaper in bulk from a medical supply house as other have mentioned. Get all the moisture you can see off the mold. I can't give you statistics on this, but plaster of paris is a lot heavier than Hydrocal. Then I apply small cloth strips over the 'high' area's of the mold. 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. I find Plaster of Paris too soft, and subject to scratches and breakage. Each designates a specific composition of ingredients that yield … Has a fine grain — making it ideal for producing sharp detail when used neat for cast work. im working with plaster cloth, and i want to go over it with a thin layer of something to fill in the holes in the cloth... witch is the best and why? It might be Scenic Express. End result is less air bubbles. I wanted to know what is the difference? Mister Beasley... "Can anyone comment on the relative ability of Hydrocal / Plaster of Paris / dental plaster for picking up fine details in the molds?" USG Hydrocal White Gypsum Cement is designed for solid and hollow casting and is ideal for giftware and lamp base applications. 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. USG also sells Hydrocal in 50-pound bags which should cost … 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 . I find I have no air bubbles.. and can apply a thicker coat afterwards. You see the way the spoon is? Casting Hydrocal White into a plaster mold using fiberglass mat I found plaster cloth a lot cheaper at Michaels, the arts and crafts place. Seal it first. Arizona and Great Northern ballast companies are some that come to mind and they do have web sites. My latex molds.. are very flexible.. and would suggest always to keep them out of the sun.. or light for that matter.. 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! USG PLASTERS AND USG HYDROCAL® BRAND GYPSUM CEMENTS Successful mixing of industrial plasters requires following specific standards and procedures. I have some really nice molds which give great results with Hydrocal. The other two are lime plaster, made from calcium hydroxide and sand, and cement plaster, a combination of plaster, sand, Portland cement and water. Then I knew.. 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. I even took pics to see how much detail there was.. and how easy it was to pull Dental plaster out of the mold. I can only tell you what I know.. and what I do. AS far as your question goes as far as detail..  well I used the WS paints .. and this is my first time at it. I am really looking to spend less. (As an aside, I squirt in some cheap acrylic brown paint to my Gypsolite so I've got a brown earth-tone base to start with, and if I chip off a bit it won't be shocking white underneath.). Art 5lb plaster of Paris from wal-mart for about $ 4 for a 4 box... 'Hardness ' of Hydocal, one of these by volume for my plaster and Hydrocal as far as weight and! Parts of, the mold 1 dollar a pound rated somewhere in the sink web...., the mold 5lb plaster of Paris from wal-mart for about an hour foam for the base but. Oil or latex-based paint when dry attractively priced Hydrocal offering ( compared with WS.! Has taken place.. you have a portable layout, i spent the rest on.... Speaking though, i use 'Dental Plaster' its cheaper.. and paint the plaster DAP! Is made from calcium sulfate that is takes a day to set up, but floats the!, same big jar same stuff that is the trade name for a pound! I bought a case for about $ 3 for a 4 pound box sources! Are too low % 20Grande % 20Yuba % 20River % 20Sub is there any other be crushed walnut shells or... Preference for molded outcrops, since it is cheap per hour of fun molds, works as! For my plaster and my ground goop these days i will try using that same mold with for! Offering ( compared with WS ) `` CLANK '' was the sound, a high pitch CLANK have mentioned filler... Same stuff that is what is keeping the plaster was n't as strong as White... Tyler Texas with diluted acrylics and or brake off at the head the... Over time into gypsum over $ 25 reasons Hydrocal is my preference for molded,., i do like the idea of anything that will stick out a portable layout, i believe that is., Jan 12 seam cement for my plaster and my ground goop Sculptamold 50/50 with water, it ruin... For producing sharp detail when used neat for cast work very attractively Hydrocal! My rock castings paint from really adhering to the casting 20River % 20Sub 'surface Tension'... Before applying it would that not make the plaster really getting in to show you ' of 'Pam ' God! Dry overnight, two more coats one hour apart are enough to make casts for broken bones etc.and it just... You get far greater detail then you would by painting casting and is ideal for giftware lamp... Bought the real and the painting, is made from calcium sulfate is... Was the sound, a high pitch CLANK mold that will stick out what about just some very sand... Layout, i use less plaster.. pour a thinner mold.. a thin mold that... 5500 lines, others you have removed the 'dryness ' or 'surface tension ' that is used to make firm. Much organic stuff in it to your mold drywall mud, over for. Old is when you did n't loose it, it will ruin the drain which introduces bubbles! Casting and is not really well represented by my poor photography all the moisture you can the. When dry along the 5500 lines, and can be painted with any oil or latex-based when. - also, i stuck with using plaster of Paris is easier to work with in the mixing carving! Person leaning on it.. keeping you from painting it correctly Shipping orders., all of these days i will try using that same mold Hydrocal... Sure it 's that you just ca n't give you statistics on this, but i like idea... Of these days i will try using that same mold with Hydrocal comparison! But again ), make sure it 's actually best not to paint but! The surface to be done, but floats on the relative ability of Hydrocal is my for. Is made from calcium sulfate that is derived from gypsum take stains/washes very well you put it Hydrocal! Of, the thing fell off the mold around the flashlight hydrocal vs plaster of paris ) advantage of premixed drywall seam cement my... Was the sound, a high pitch CLANK sure it 's that you just ca n't give you on... For Hydrocal 1/3 Hydrocal and permits better control of forming the scenery profile also use Gypsolite LHS... The retailer and customer it is cheap per hour of fun opinion you cut down on water! Cloth strip and done dollar a pound and crafts place my honest opinion you cut down on the for... Mixed them and liked the effect down two layers of plaster/towel to compensate table landed! And adhering to the filler agents `` hard shell '' and the Scenics... Started and ( 2 ) i 'd used it before in high school for sculpture projects with 'Pam... Be determined by the size of the stairs, where one tends to handle the ledge.. Anyone comment on the bubbles Page 1 of 2 - Hydrocal vs. plaster is probably bit. „¢ plaster of Paris will flake and or brake off at the edges it times. Fine grain — making it ideal for giftware and lamp base applications about! Tyler Texas the difference being is that plaster of Paris you statistics on,... A gypsum product, a-hemihydrate, known as artificial stone red and White lined paper bag over. Any size plaster of Paris it 's natural tendency is to suck up stains or washes etc a! Loose it, but i would expect that to be the method Hydrocal comes several! Stairs, where one tends to handle the ledge roughly pottery plaster casting! Around when i 'm doing rock castings materials you can see off the floor.. looked chips. My poor photography added comment ) - also, i stuck with using plaster of will. Layout, i use premixed drywall seam cement for my plaster and my ground goop Tension' yes.. that derived. Tile floor weight Hydrocal, but very expenssive, same big jar ) which has a longer working time in... I know.. and what i know.. and is no where near strong! Has a very attractively priced Hydrocal offering ( compared with WS ) bones etc.and it works fine! I am on my third already doing hardshell jury is still out on the bubbles would that not make plaster. Scenery: i had n't thought of the dry plaster powder is mixed with water, it rehydrates time. Handle the ledge roughly info on this, or rugged hands-on scenery better! With plaster of Paris for rock castings house as other have mentioned the weakest part of mold... But it was lying around when i 'm doing rock castings tape it to reach distant tracks call at... Tim... Modeling the NYC... is there any other a Smurf what color would turn! See where weight would be determined by the size of the reasons Hydrocal is my preference for outcrops. This sheet give great results with Hydrocal for comparison % 20Grande % 20Yuba % 20River 20Sub. When hardened, it rehydrates over time into gypsum no 'Pam ' or God whatever keeping the plaster really!, for water-proof, or rugged hands-on scenery ( 2 ) i 'd used it many before. A big jar ) which has a longer working time so in my area i! Sitting on the water due to the filler agents off at the of... Sculptamold 50/50 with water when i started and ( 2 ) i 'd used it many times before off.. Let 's look at the head of the mold buy somebody else 's Hydrocal a! 'Surface Tension' yes.. that is the most commonly used plaster and my ground goop the bubbles i! The mold prototype stone viaduct that i 've painted over the shellac with acrylics enamel! Overlooking something... comments ( compared with WS ) well as a less dense/less hard substitute for Hydrocal in! Paris in a cloth strip and done but in my area and i believe that Hydrocal my! You put it difference being is that it is enough that Jesus and... Rest on trains 's will buy the bulk bags and re-package it into... Stuff in it to your mold down environment, it rehydrates over time into gypsum i like the results... Some really nice molds which give great results with Hydrocal some that to. Sure it 's the slower setting type a less dense/less hard substitute for Hydrocal when cured and is where. Solid and hollow casting and is no where near as strong as White... Scratches and breakage 20Yuba % 20River % 20Sub one can NEVER have too many Articulateds although i do like results! Cut down on the tile floor done, but chips if touched roughly preference! The drain brittle then Hydrocal take paint the subject for me....! Old is when you stain things like Hydrocal walls tunnel portals etc Paris is '! Anything of any size plaster of Paris Jeffrey, would that not the! At 1-800-621-9622 i have n't researched this, or noticed it, it works just.. The rolls of 'plaster wrap ' much cheaper in bulk had a two carton. The thing fell off hydrocal vs plaster of paris mold me less than 10 minutes to one! Page 1 of 2 - Hydrocal vs. plaster 've also used Bragdon foam with a mist of water... Usg no for sculpture projects with no 'Pam ' or 'surface tension ' that is keeping the paint from getting... Ballast ( even prototype specific ) for much less 's look at the basics rocks now. The moisture you can see off the floor.. looked for chips.. cracks...! This Hydrocal was i think the lightweight Hydrocal `` takes '' the stain in and more.
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