I have used your kit to restore a Steering Wheel (hard plastic) on my ’66 Datsun Roadster. I used the Plastic Adhesion Promoter and the SEM Landau Black paint included in the kit. It looks good, but is rather flat – flatter than the original finish, I believe. Can I use a clear coat like Diamond Clear over this on the plastic without risking cracking or peeling later? How can I get a little glossier finish and still allow for flexibility? Thanks!