Typically you should mix epoxy with microspheres (glass balls is what I call them ) you mix to a easily spreadable consistency, spread evenly over the foam. This mixture is lighter weight than pure epoxy is the idea behind it. The pores in the foam are filled with this micro mixture. When I say spread evenly, typically only the mixture will be down in the pores of the foam and some wetness from the epoxy will be on the surface with some of the micro in it. Then yes you lay your fiberglass over this mixture, smooth it out with a squeege, paint brush or whatever you will be using while it is still wet. Mix more pure resin at this point to finish wetting out the fiberglass cloth. Add as many layers of fiberglass cloth as you plan to use totally at this point, using only pure resin for all layers. Do not put micro between layers. When you are applying multiple layers of cloth some of the micro from the foam surface may wander up to the top layers when squeegeing and stippling with a paint brush but do not worry usually not enough to matter. When you have all of your intended layers of cloth down and wetted out, then lay your layer of peelply on at this time if you are going to use peelply. I personally usually do not use peelply to cover the entire surface of a large fiberglass cloth layup, but some people do and there is nothing wrong with that, I use peelply strips along the edges to make them lay down and transition in to a smooth edge. If you do not at least use peelply along the edges of your wetted out cloth, when it hardens it will be sticking up and form a very rough area. If you put epoxy and flox on top of foam and let it harden, it will be really rough and will require sanding smooth before you apply layers of cloth and will probably end up more heavy than if you use the above technique. I guess you can experiment with some 12 inch square pieces both ways and see which is lighter weight and also which way you prefer. Personally I wll take the no sanding way and do it all in the top steps. Larry H.
From: "[email protected]" [email protected] epoxy and flox over foam.
