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No, sorry. Plaster of Paris expands and the plaster will stick to your molds and is impossible to remove. It will also remove some of the fine detailing of your mold. An alternative is to put the plaster on one of your finished pieces, half at a time to get a mold of the piece. This will give you a new mold of the piece without destroying your original mold.
Do not "stick your hand in a bucket of plaster of Paris" as someone previously suggested!Plaster of Paris can get really hot while setting and you would end up severely burning your hand...A slightly more sensible approach is to make a mould of your hand using something like clay or alginate and then use that mould to create a plaster of Paris duplicate of your hand...
can anybody tell me please i want to know if i can paint fiberglass Matt over a plaster of Paris shape witch i have taken again from a rubber mould is it possiball to do this
Buy some concrete or plaster of paris. Mix and pour in a small square baking pan (one you don't use for baking is best). Coat the mold with cooking spray or vaseline and when the plaster starts to set up, press the paw into it-you could probably even do stepping stones with the right mold.
some people told me to put pva glue to the mix
plaster.
The hardness of plaster mold silicone rubber refers to the amount of pressure required to form indentations on the silicone rubber. The higher the hardness, the greater the pressure needed. Plaster mold silicone can be used for a variety of applications, including medical devices, food-grade products, and cosmetics.
The plaster mold is very, very dry. When you pour, the clay slip is mostly water and the plaster mold sucks up the moisture quickly, creating a coating inside the mold. It's like pouring gravy onto a sponge...the water is absorbed, but the solids stay on top of the sponge if you leave it long enough. It's the same way with a plaster mold..it's a sponge. That's the reason you watch the pour opening and pour out the excess when it is the thickness you need. The plaster will continue to absorb until the clay pulls away from the mold naturally, yet it is still green.
mold
Since the mold absorbs water, if you want to get a good pour don't let the mold too wet. One excellent indication is how heavy it is because the thing is waterlogged. Sitting it empty in your kiln room is one way to get it dry. DO NOT cook the thing! But a hot dry environment is the best way to keep your molds useable. I wouldn't pour in the same mold more than three times before letting it dry up some. If you pour too much at a time, you lose the fine detail because the plaster deteriorated. If it's a very popular mold, try getting two.
Are you trying to get the footprint of bigfoot?!?
Squirt on vinegar and water (1:1 mix) with a squirtbottle and leave overnight.