I have my CNC milled PU foam from my 3D files all cut out and looking great.

Do I coat them in epoxy laminating resin direct onto the foam ?

Then I have a more hard wearing surface to build up my release agents to then eventually resin infusion in Epoxy FRP also. 

I'm concerned that the patterns are very valuable and wonder if the precaution of taking a mould of these as they are, would PVA work on the foam as a release ?

Any advice ?