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Sealing Molds

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I used to remelt my old plastics and repore into pop molds I made and sealed with spray enamel and also molds I made with bondo my question is what other products do you use to seal pop molds I usually just let them dry for up to two weeks before use don't pour plastics much just when I build up a lot of old plastics but thinking about making a swim bait mold

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I've used both carpenter's glue and thinned D2T epoxy.  I prefer the epoxy.  Two thinned coat (thinned with denatured alcohol AFTER the epoxy is thoroughly mixed) and brushed on.  After five minutes or so I remove any excess that hasn't soaked into the POP so I don't lose any details from epoxy ponding.

I've use runny super glue for repairs, so it would probably work as an overall sealer, too, but it's expensive for me to use.

Edited by mark poulson
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I do what Mark does.  I first mix up a batch of D2T but I make it almost like water so that it penetrates deep into the mold. 
The next coat I make a little thicker and so on.  It takes a while with D2T but when you are done the molds are indestructable.  The thinner you make the epoxy the better the detail.  You can actually drop them and they won't break.  Here is a pic of a Mann's jelly worm that was discontinued years ago.  The mold is around 12 years old.

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