Not a fan of painting onto iron on covering. I once sprayed DuPont chroma base and clear on white Monokote with OK results but chipped easily. The covering was scuffed and then cleaned with acetone. The 3W aerobatic ARF airplanes have painted Untracote and they chip up rather easily also. IMO if you want to paint, covering the wood with 3/4 oz glass cloth and epoxy resin is a much better way to go.