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I would recommend coating. But if that P 20 stuff is good or better than the paint that will be way better than nothing at all. If so, i'd start fresh and get them bead blasted. Scuff them a little with steel wool, clean them really well and start painting. Put MANY thin coats on right before you are gonna install them or put them in the oven to bake the finish on.
I painted mine with about 6-10 good coats then installed them the next day. Let the car idle to get them hot, let it cool and repeat like 4 or 5 times. The finish still looks like new after about 5 years except where it got scraped by a speedbump/etc.




