I ran into this problem when I tried to do a 3D american flag on my Byron's CAP 21. I ordered a roll of transparent blue vinyl, and it matched pretty well, except the gloss level. The vinyl is on the wings, the transparent blue is over the white on the fuselage, right behind the cowl. Cowl is painted with testors candy blue, and cleared with water based polyurethane (gas engine, not glow).