The fabric covering does take paint really well. If you got a clone of the CMP like I did you'll have the plastic covering and it is junk. The paint will chip right off. Thus the glass and zpoxy treatment. I pulled all the covering off and filled in a few imperfections with balsa filler. After that dries you can sand it smooth. Make sure all the dost if off. I used .5 oz cloth as I'm not needing to add so much strength and it will keep it light. Cut the cloth to size and then set it aside. Then mix up your zpoxy and coat the surface of the wing. Now place the cloth over the wing and use a flexible card like the maxxed out credit card from buying the retract to squeegy out the excess resin and to smooth the cloth out. You dont' want any wrinkles or bubble in the cloth. Make sure the ends are soaked and then let it dry. Now you can come back a trim off the overhang of cloth and then do a light sanding to knock down the high spots. Some people will prime at this point and then sand down to find any low spots. Either way you'll need a second coat to fill in the weave and allow you to sand to a smooth finish.

This is a brief description of the process and there are better descriptions out there. You can also use other resins depending on weight allowance and materials used. If galssing direct onto foam I would use a water based polyurethane first.

I'll still post some pics once I get a chance to take some later today.

Steve