I see haze on the mold. What causes it and can I get rid of it?

Haze On The Mold After Applying Release (before molding): This can be caused by reaction of the release with contaminants on the mold surface; styrene in the mold blushing to the surface and becoming entrapped; entrapment of moisture in the curing release (particularly in very humid conditions); contaminated application cloths or wipes; condensation (particularly when molds are cooler than air temperature).

Haze That Appears After Molding: Heat as a catalyst can drive moisture, un-reacted styrene or other un-reacted materials up through the mold matrix during the molding process, entrapping them between the mold surface and the semi-permanent film. Over several molding cycles the styrene can also polymerize leaving a tenacious film on the mold surface. Compounding is the preferred method of removing this buildup.