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Thread: Using drywall plaster for molds?

  1. #1
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    Using drywall plaster for molds?

    There is some problably real quick shoot down for this idea but why not?

    Drywall plaster dries fairly slow and dries really hard.

    It is fluid and it is easily shaped when wet and comes out with a smooth finish. It can be shaped when hard with simple tools. It can even be carved if careful.

    I doubt seriously that fiberglass would stick to it and if it did the plaster could just be sanded off the fiberglass.

    Probably cracking would be the biggest problem but you are using it to get a shape not durability.

    It is super cheap and always consistent, no mixing required.

    I guess a similar question would involve the use of cement for a mold. Will fiberglass stick to cement?

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  3. #3
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    plaster is excellent for moulds... plaster moulds are used very commonly..., just not durable for multiple casts , but for a 1 off no problem....

  4. #4
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    LOL plaster of paris and sheetrock is not the same.

    One is for crafts and mold making etc, the other to keep a seal on a drywall and patch up holes. It cracks and is meant to be painted.

    Goto the craft/art store for mold making plaster.

    better yet, if you only need the mold once and it needs more detail than you can get with plaster, try Alginate (ask your dentist, or a dental supply store)
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  5. #5
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    I've done a few moulds with plaster of paris.... it works.... there is plaster specifically for moulding.. I've never used it to know the difference though

  6. #6
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    Ok, what I used was actually casting plaster, I put plaster of paris because that's what people generally call it, but what i used is finer.

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