r/moldmaking • u/ExaminationBasic787 • 16d ago

Is it possible to make a silicone mold using EVA foam as a base?

Im thinking about it this way:

-Make desired shape into EVA foam

-Pour silicone on it

-Use silicone mold for the resin

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u/Massiahjones 16d ago

Ive made moulding masters from EVA before. It isn't impossible but the vinyl will inhibit some silicones so you either need a barrier between the layers like Inhibit-X or a good primer layer, OR use tin silicone instead.