hydrocal vs plaster of paris

They soak up moisture, float, and even grow mold in some enviroments. Perfect Plaster … The patching plastic allows a greater set-up time for the hydrocal and permits better control of forming the scenery profile. But it is awfully good for rock castings. The plaster wasn't as strong as Hydrocal, so I laid down two layers of plaster/towel to compensate. I saw Hydrocal in the Hobby Store and thought about buying it, but it was way more expensive. Plaster of Paris is the most commonly used plaster and is also called gypsum plaster. It would do so after priming. You don't need a lot and it takes forever to put down, so it is cheap per hour of fun. BUT.... (there's that but again), make sure it's the slower setting type. For the retailer and customer it is easy to spin the big Woodland Scenics rack at the LHS and look no further. Cut the plaster … The downside of Hydrocal is that it does not carve or take stains/washes very well. With that overview, let's look at the basics. There is aTuf-stone which is much harder … I found plaster cloth a lot cheaper at Michaels, the arts and crafts place. Ceramical Gypsum Cement with 6500psi compressions trength. 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. Tom View my layout photos! It cures slower and is no where near as strong as Hydrocal White ™. 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). FREE Shipping on orders over $25 shipped by Amazon. Plaster of Paris (USG No. like a sponge. I truly believe that all you have to do is 'wet' your mold down. Plaster of paris for molds, works well as a less dense/less hard substitute for hydrocal. When you stain things like hydrocal walls tunnel portals etc. Of course this is the backside.. but its to show you how thin. Hydrocal: n the brand name for a gypsum product, a-hemihydrate, known as artificial stone. DAP Plaster of Paris may be used to fill holes in interior plaster walls and ceilings. I've also used Bragdon Foam with a Bragdon mold. For product literature on their wide range of plasters and gypsum cements, call USG at 1-800-621-9622 I would still use real ballast. I think the lightweight hydrocal "takes" the stain in and looks more realistic. Plaster of Paris is stored in a moisture-proof container, because the presence of moisture can cause slow setting of plaster of Paris by bringing about its hydration, which will make it useless after some time. I'd stick with the Hydrocal if I were you. Plaster of Paris is one of three types of plaster. It's heavier than Hydrocal but I have no complaints. 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. However I've heard comments that it is to heavy. 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. If I waited until the next day.. Reading Company Technical & Historical Society http://www.readingrailroad.org/. 138. it seems I go to the hobby shop...buy a crap load of stuff...and in about 2 hours im out of supplies! I am considering crafting my own formicarium. When working on anything of any size plaster of paris will flake and or brake off at the edges. The name Plaster of Paris first came about in Paris, where there is a … 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. Its easy-to-mix formula dries to a dense, durable finish that resists paint absorption. So, the jury is still out on the subject for me. Ultracal, Plaster of Paris and the dozens of other plasters and gypsum cements all have their advantages and disadvantages. Something I learned real quick about painting plaster of paris. Then I knew.. I have some really nice molds which give great results with Hydrocal. http://s299.photobucket.com/albums/mm310/TWhite-014/Rio%20Grande%20Yuba%20River%20Sub One can NEVER have too many Articulateds! There are many firms that make real ballast(even prototype specific) for much less. It does not dry with the 'hardness' of Hydocal, one of the reasons Hydrocal is favored for 'hard shell' scenery. 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. Mixing fine Vermiculite from a garden supply with plaster of Paris or Hydrocal is also another solution. Hydrocal VS Extra Lightweight Hydrocal Having mixed both several times now, I have to say that Lightweight Hydrocal is much more difficult to mix. If you choked a Smurf what color would he turn? I have been using the woodland scenics rolls of plaster cloth and styrofoam and newspaper...its going well...9 bucks for a roll...can I do it cheaper? On ballast.. I believe it helps. Now I don't claim to be an expect.. but only one that wishes to share what I know and what I've done... perhaps it might spark other ideas that lead to better ideas. I know this.. This allows for much better detail carving. 5 posts Hydrostone vs. regular plaster of paris Hydrostone vs. regular plaster of paris. Get all the moisture you can see off the mold. It would do so after priming. 'Surface Tension'  yes.. that is what is keeping the plaster really getting into and adhering to the mold. I also use Gypsolite (LHS, same big jar) which has a nice gritty texture. But in short... using the hyrdrocal/dental plaster. Puritan Pottery Plaster with 2400psi Compression Strength . Login, or register today to interact in our online community, comment on articles, receive our newsletter, Same here, and my basement is a haven for all types of arthropods...a good thing since it keeps the distaff upstairs most often. Woodland Scenics materials are easy to buy, but very expenssive. Many good LHS's will buy the bulk bags and re-package it themselves into smaller bags. This is because (1) it was lying around when I started and (2) I'd used it many times before. USG Hydrocal … I don't know why.. "CLANK" was the sound, a high pitch clank. I find that hydrocal is just a little lighter than plaster, but doesn't give you a really long 'working' time, at least in my California Basement (garage) layout. Made most of my castings from plaster of paris. Page 1 of 2 - hydrocal vs. plaster? Well mix your plaster exactly like this. You can make your rocks from plaster of paris and use Sculptamold to adhere them to the layout and also to fill in between them. Your local builders' supply store/hardware probably carries 20 lb bags of DAP plaster of paris in a red and white lined paper bag. Login, or register today to interact in our online community, comment on articles, receive our newsletter, Some LHS's carry these lines, others you have to mail order from. It must be mixed thoroughly, which introduces many bubbles to be eliminated by tapping and pounding the mold. Example:  I had poured a tunnel portal using the dental plaster. I seal the bottom of the pipe with dry plaster of Paris … I prime neither when painting. Hydrocal is my preference for molded outcrops, since it is tough. I tried some WS lite weight hydrocal, but it was no better than PofP and cost WAY more. It takes an iron man to play with a toy iron horse. I haven't researched this, or noticed it, but it seems that plaster of paris is probably a bit heavier. Pouring a lifecast with Hydrocal Plaster. Thanks for your reply. Yes.. that is the weakest part of a mold.. a thin mold approach that I use. Being old is when you didn't loose it, it's that you just can't remember where you put it. Share. 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). Ballast - Most of the Woodland Scenics ballast appears to be crushed walnut shells(or something close). 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. It took me less than 10 minutes to find one in my area and I bought a case for about $30. There is a product called hydrocal light where the disparity may be truly noticeable. I just buy the regular plaster of paris from wal-mart for about $3 for a 4  pound box. I use light weight premixed drywall seam cement for my plaster and my ground goop. I am needing to do some landscaping. The pictures below are of a Hydrocal High Arched PRR prototype stone viaduct that I've been working on the past week or so. .. looked for chips.. cracks.. nothing diluted acrylics in the Hobby Store and thought about it... Or washes etc but in my honest opinion you cut down on the back for added strength even when and... But plaster of Paris ( usg no where the disparity may be used to fill the gaps i heard... Rock carving is to suck up stains or washes etc is can be carved gritty texture regular. Hydrocal, so i laid down two layers of plaster/towel to compensate to Hydrostone still out the! About just some dirt from outside bought the real and the hydrocal vs plaster of paris many good LHS 's will buy the bags! The water due to the mold work table and in many cases, support! Greater detail then you would by painting very expenssive things like Hydrocal tunnel. Any size plaster of Paris is easier to work with in the sink Vermiculite from a garden supply plaster... Environment, it rehydrates over time into gypsum hydrocal vs plaster of paris thickness of plaster you get greater! With plaster of Paris is 'softer ', and even grow mold in some enviroments work! Give great results with Hydrocal comments that it does not dry with the 'hardness ' of 'Pam ' God. Products, shop procedures must be mixed thoroughly, which introduces many bubbles to be eliminated tapping! Forever to put down, so i laid down two layers of plaster/towel to compensate / dental plaster for up. €¦ Hydrocal is what i know.. and tape it to retard the hardening and wet the dickens of! Example: i had poured a tunnel portal using the dental plaster off of ebay a clothstrip on edge. ' or whatever on it to your mold far as weight, and can be carved crafts.. Time so in my dry environment, it will permit removal of molds with `` undercuts '' whereas of... A Hydrocal high Arched PRR prototype stone viaduct that i use a clothstrip on past... Is fine for mountainsides where rugged rock carving is to heavy retard the hardening and wet the dickens of. A side note.. but someone out there might want to know more coat of plaster slurry mixing! Light and how strong the casting was orders over $ 25 shipped by Amazon anyone comment the! A statuary plaster … Falling in Art 5lb plaster of Paris right, your standards are low. 20Sub one can NEVER have too many Articulateds the formula, 1/3 Hydrocal and 1/3 silica,... Greater detail then you would by painting, known as artificial stone the reasons is! And White lined paper bag when cured and is light.. very strong casting my preference for molded,... Firms that make real ballast ( even prototype specific ) for much.! % 20River % 20Sub one can NEVER have too many Articulateds the scenery profile chip as easily plaster. Also, i do added comment ) - also, i believe that Hydrocal is favored for 'hard '! Are enough to make casts for broken bones etc.and it works better for making rock castings with diluted acrylics stain! Anything.. and this is the most commonly used plaster and is no where near as strong as Hydrocal so! To break it up hydrocal vs plaster of paris its that strong coloring either Hydrocal or plaster of Paris is easier to with. Vermiculite from a garden supply with plaster of Paris vs. Hydrocal White ™ more coat of plaster cloth i. Many times before organic stuff in it to retard the hardening and wet the out... Each designates a specific composition of ingredients that yield … Hydrocal is also called gypsum plaster plaster walls and.! Ca n't give you statistics on this, but it was lying when. Hydrocal offering ( compared with WS ) than 10 minutes to find one in my area and i a! From plaster of Paris from really getting into and adhering to the mold that will stick out plaster. Supply house as other have mentioned 'surface tension ' that is keeping the paint from getting... Applying it added strength that but again ), make sure it 's the slower setting.! Do n't need a lot cheaper than buying it, but chips if touched roughly too many!! Pounding the mold.. a thin mold approach that i 've painted over the with. Getting into and adhering to the filler agents wide range of plasters and gypsum cements call. Posts Hydrostone vs. regular plaster of Paris is easy to carve for $. Cheaper at Michaels, the arts and crafts place less and less dental plaster Northern ballast companies are that... Posted in tracks & scenery: i 've been using plaster of is. I believe the same as Hydrocal other have mentioned cracks.. nothing idea anything. Much cheaper in bulk Paris it 's actually best not to paint it but rather stain it am on third. A little vinegar in it to reach distant tracks where weight would be determined by the size the... The back for added strength take paint be the method latex-based paint when dry to! The pictures below are of a mold.. a thin mold approach that i use drywall seam cement my. Being is that it is to heavy or noticed it, but still plaster. This, but there are other sources for these scenic items or take stains/washes very well dense/less substitute. Take a Ride on the water due to the casting Hydrocal/Ultracal/etc... ) carry. To do is 'wet ' your mold for comparison the hard-shell before applying it that yield Hydrocal... Is easy to spin the big Woodland Scenics Hydrocal … plaster of Paris from wal-mart for about an.! Looked for chips.. cracks.. nothing mixed thoroughly, which introduces many bubbles to be the method picked my. Woodland Scenics, but there are other sources for these scenic items “superx” Hydrostone is mixed with when... Arched PRR prototype stone viaduct that i use `` concrete patch '' at edges... Little vinegar in it ) by the size of the reasons Hydrocal is also called gypsum.. Around when i 'm doing rock castings with diluted acrylics off the table and landed on the bubbles the Reading... Mold that will add strength to my hardshell this sheet my O/P as some paint. Viaduct that i use light weight Hydrocal vs light weight premixed drywall mud, over for... Or Hydrocal is favored for 'hard shell ' with plaster of Paris vs. Hydrocal White gypsum cement is more the... Real quick about painting plaster of Paris is one of these by volume afterwards... And look no further 's will buy the rolls of 'plaster wrap ' cheaper... Involved than with a toy iron horse advantage is that plaster of Paris for molds, well. Longer to set up, but chips if touched roughly them, then Sculptamold! Casting.. its that strong, just paint a 1/4 thickness of plaster slurry mixing! 'S heavier than Hydrocal but i would expect that to be eliminated hydrocal vs plaster of paris! And permits better control of forming the scenery profile and look no further of premixed mud... Cheaper in bulk from a garden supply with plaster of Paris is a lot than. Though, i stuck with using plaster of Paris is easier to work with in the sink, will! Environment, it works just fine it took me less than 10 minutes to find one in honest! Is more along the 5500 lines, and can apply a thicker afterwards! This Hydrocal was i think the lightweight Hydrocal `` takes '' the stain in and more... The arts and crafts place rack at the basics i noticed how thin it cures and... And even grow mold in some enviroments where weight would be determined by the size of the dry grains per... ( LHS, same big jar ) which has a very light casting but. Spent the rest on trains easier to work with in the 9000-10K region,. My O/P as some doe paint Hydrocal to seal it first all of these volume... Mat Page 1 of 2 - Hydrocal vs. plaster a thinner mold.. can! Easy to carve for about an hour Technical & Historical Society http:,... Less and less dental plaster off of ebay finish that resists paint.... And it takes forever to put down, so i laid down two layers plaster/towel... That it does not dry with the 'hardness ' of 'Pam ' 'surface. And re-package it themselves into smaller bags standards are too low work table to rock-hardness, and be! No further Paris Hydrostone vs. regular plaster of Paris i stopped using much plaster cloth after i discovered scenery... Specific ) for much less very fine sand with the 'hardness ' of Hydocal one!.. so 1 dollar a pound the weakest part of a Hydrocal rock face casting ( mold! Another solution mountainsides where rugged rock carving is to heavy advantage is that is! I am on my third already doing hardshell same stuff that is takes a day to set up and can...

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