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frankC

Rubbing Plaster Of Paris Into A Mold

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I have a mold with some micro bubbles, I'm worried the plastic will pick up on the bubbles if I seal them in.

 

I will be using Elmers glue to seal the mold. 

 

Can I mix up some POP to rub into the mold and smooth it out before I seal it? Or will these new pieces not bond with the mold 

 

 

 

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Ive had to patch more holes than id like to admit in my molds

Ive tried bondo, then ruined the mold trying to sand it down

Wood filler worked, but could not handle the heat from the plastic

Tried filling in with strait wood glue, took too long to dry and runs all over the place

Plaster on plaster is your solution... Just brush it on like paint... If you get rough spots, brush over those with water..... Weather it bonds or not doesnt matter, the sealer you apply will hold it together

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Just wanted to add if your using epoxy to coat your mold than you can use almost anything including wood filler,bondo,even epoxy to fill the holes before you apply the sealer coat

Good point, as the epoxy will form a hard shell, it won't matter whats under it...... But for ease of use, plaster still gets the nod from me

I forgot to mention that most of my molds are DWP (Durhams water puddy)... With the DWP, you can mix it thicker and still get more working time in the cup... But when its thinned out, it nearly dries on contact, perfect for patching holes cause it has no time to drip or run

I see no reason why you couldnt use DWP to patch holes in a pop mold, i havnt tried it, but it should work

Edited by JRammit
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