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Old 06-10-2010, 02:59 PM   #1 (permalink)
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Default Plaster molds

I made some plaster molds. I need help cause the baits get a white color from the plaster. I also got some molds I bought, made of plaster, and they are fine. It looks like something has been put on these molds to stop this from happening. It's like a coat of yellowish something. Does anyone know what i'm saying?
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Old 06-10-2010, 06:42 PM   #2 (permalink)
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Default Re: Plaster molds

Ok answered my own ? Took it to hardware store and it had been glazed.
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Old 06-10-2010, 09:08 PM   #3 (permalink)
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Default Re: Plaster molds

Try some good old elmers white glue like the kids use in school. After the plaster goes through it's own heating process and starts to cool then it is the time to remove the originals and clean up the mold with a knife. Then put it in the over at 325 for at least an hour to remove the moisture. The glue wont stick well with moisture still in the mold.

Get a small cup or shot glass because it is time to flood the mold. 1 part water and 3 parts glue to a milky consistency. Then spread the glue over all mold surfaces to seal. Let it remain in the cavities for a couple of minutes, swish it back and forth to ensure good coverage. Drain excess by shaking the mold and after the glue dries it's ready for a test pour. Sometimes a second coat is needed. If you have bubbles in your pours you can apply more glue in only those cavities by flooding or with an artists brush.
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Old 06-10-2010, 09:18 PM   #4 (permalink)
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Default Re: Plaster molds

Great tip Beer
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Old 06-10-2010, 11:21 PM   #5 (permalink)
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Default Re: Plaster molds

Awesome advice Beer!

I never thought of using elmers for that. And it will withstand the 300+ temps of our plastic too huh? thats great!

by the way, where you guys finding POP? I checked out Hobby Lobby by me and they didnt have any there.
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Old 06-10-2010, 11:41 PM   #6 (permalink)
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Default Re: Plaster molds

I got some casting plaster on ebay. 30lbs for 24$ free shipping.
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Old 06-11-2010, 07:07 AM   #7 (permalink)
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Default Re: Plaster molds

It can take the heat somehow. I use a brush that Harbor Freight sells in a pack to paint the whole surface of the mold to make it look better and easy to clean up. I got the POP at walmart in the hobby section. They had #3 and #5 boxes and I found sculpy right next to it.
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Old 06-11-2010, 02:23 PM   #8 (permalink)
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Default Re: Plaster molds

I wonder if clear poxy would work. Or that paint for BBQ's that handles 500deg heat. But wonder if it will stick to plaster?
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Old 06-11-2010, 09:31 PM   #9 (permalink)
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Default Re: Plaster molds

I suppose you could use those but you really can't go wrong with 1 drop water and 4 drops of glue.
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Old 06-12-2010, 09:19 AM   #10 (permalink)
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Default Re: Plaster molds

Did elmers glue last night. Try pouring today.
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