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3 questions about foam latex

Franciska ErdeszFranciska Erdesz ✭
in Lab work
Hi,

I have 3 questions about foam latex.
My gelling time is about 20minutes or more, is it normal?
secondly when I get the mold out from the owen there is always a part where it doesn't fried and I have no idea why. The whole mold and negative is made with epoxy and I put everywhere carefully the releaser. Any ideas for this?
The third thing is when I demold it it is fried but the foam has wet feeling, doesn't matter if I put on it powder or not!

Thank you for your suggestions!
Fifi

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    Franciska ErdeszFranciska Erdesz ✭

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    Reuben DiamondReuben Diamond ✭✭
    This is called laking, and it is caused by pockets of steam that get trapped between the mould and the foam. It happens with epoxy moulds much more than stone, because stone is porous. Baking the foam at a lower temperature for longer might help. 
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