I am in the process of re-installing my tailpan on a 69, it was a mess with dents and previous repairs which I had to correct. I did a lot of heating and grinding to straighten out all the dents that I am not sure what the original coating was, what is the finish supposed to be for the inside (trunk interior side) of the tail-light section? I have it primed and was going to spray it with paintable type rockergaurd so it could hold paint when I spray the trunk interior.