I talked to John McBean and he made a great suggestion. He said I should do the wing bays near the fuel tank in Aerothane so they wouldn't get fuel stains that wouldn't come out if it was Polytone.

I did my wings in Aerothane and got a few runs with the final color. I did the fuselage in Polytone for repairability in case I ever get a cut or rock hole in the fabric. I did the cowlings, doors and panels in Aerothane and have a little mismatch of the reds.