I've had my first experiences with a PU resin (Xencast P6). I get decent castings but after demolding the casting is sweating an oily substance. Is this always the case with PU resins? I switched from epoxy to PU to increase production, but now I have to leave them sweating a few days and clean the parts.

I am casting a 15mm thick part in a 2-part mould CNC'ed out of Renshape 5173 pu toolingboard. The release agent is Easy Lease. I shake Part A thoroughly before mixing.

cold temperatures won't help for sure. Cold temperatures can cause all sorts of issues with resins as well as the more obvious increased cure times.


Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant