First, welcome to the forum. There is a polyisocyanurate foam that the polyester resin does not affect. It is usually a house cladding in around 3/4" thickness. If using an epoxy, or water based urethane or whatever for a resin, then other foams are fine. The extruded ones sand nicer than the beaded white foam. Cloth is usually fiberglass, matte is good too, not maybe as strong. Lots of variables to take into account.with the given info.