I'll have to do some research, I'm not sure the radio board should be painted.
So far the repairs are holding.
The plywood for the radio was painted and the radio mounted.
The original floor mats were in generally good shape but there were some repairs needed. Somewhere I read that someone used Por-15 and fiberglass cloth to repair rubber mats. I found I needed get the mat in a position that had the pieces in the proper place. Some of the repairs took a few positioning to get the tears fully repaired.