apply sanding sealer, let it dry, sand lightly, lay 3/4 oz or heavier fiberglass cloth down and using a foam brush paint the 'glass with water or oil based polyurethane. water based is ready for recoat in as little as 20-30 minutes. after about 3 coats sand carefully and remove dust with tack cloth, then reapply about 3 more coats sanding as needed. after a few hrs you are now ready for sanding or filler primer. i then use bondo spot putty for imperfections and recoat with sanding primer after sanding. you should now have your plane ready for paint in an afternoon. very cheap and very easy and extremely light. good luck.