Use Solartex, over Solartex works very well. I built A Sig clipped wing Cub, made into A Super Cub. Covered the entire plane in White Solartex, then put A Starburst on the top of the wings and A checkerboard on the bottom of the wings and Stabilizer using Red Solartex. Been flying it with A gas engine for 8 years. Never had to clearcoat it, and while it looks weathered, the covering has held up fine.