First off, let me make a correction. You want to useAqua Net hairspray not Rave. Sorry about that. The Aqua Net will not attack the foam. Although most foam does not absorb very much resin so it is only really needed with balsa.

The application style really depends on the shape and the available equipment.

The best/lightest application of glass, epoxy & paint is to use mylars and a vacuum bag. The mylars get waxed and painted. Then glass and epoxy get applied to the mylar. The myler is then transferred to the surface and then placed in vacuum bag. Once cured the mylar peels off the layup leaving the paint bonded to the resin/glass. The paint finish mimics the mylar finish so it ends up nice, glossy, and flat (see photo of a part I made today). If the shapes have a lot of complex contours this technique does not work very well because the mylar is unable to conform properly. It works great for wings though. Your structure also needs to be able to handle the pressure generated by the vacuum bag.

A technique that works better on complex shapes is to mist the surface with 3M 77 Spray adhesive, carefully lay on the glass (use a paper carry for really light glass to prevent wrinkling), brush on the resin, absorb the excess with paper towels, and let cure. Once cured the surface gets sanded, lightly filled with resin + microspheres, sanded and painted.

If the surface isn't that complex you can just drape the glass over the surface, brush on resin, absorb the excess with paper towels and proceed like above.

The heaviest part of the whole thing will be your primer and paint.

Any panel lines can be filled with light weight spackle....like for filling nails holes in walls before painting.

What are you trying to cover? Pictures? That would really help.