Subsequently I spent the summer blasting every corner with a pressurized blaster then coating all non body panel with POR15:
http://www.rc-tech.net/pantera1/strip/strip.htm
Here is my hind sight.
Having gone through this process I have learned more about coatings. First, the POR15 loves a sand blasted surface so adhesion is fantastic.
Coating POR15 with a paint-able primer is another mater and requires a lot of work roughing it up with sand paper.
People refer to POR 15 as very hard but it really is not accurate. It is very hard on the surface but still somewhat malleable in thickness almost like an undercoating. This combination is good or reflecting the impacts of rocks.
POR15 is not UV resistant and does need to be top coated.
Having to do it over, I have come to accept the industry standard is really to coat with an epoxy primer which is tough in of itself. The epoxy primers of today are fantastic in providing a vapor barrier and they are as well very tough. If the epoxy is primer is coated with eurethane primer within a window (see instructions, (48hrs-week) it does not need to be roughed up. If it is past the window it still has to be sanded or roughed up.
I have good adhesion on the POR15; we'll see over time if it is as good as going over epoxy primer. If I were to do it again though, I am sure I would just use epoxy primer.
Gary