I washed and wiped the cover down and sprayed adhesion promoter and then sprayed primer. I also used adheasion promoter when spraying a base color. The first attached picture is after adhesion promoter/priming and then using adhesion promoter/Krylon fusion red. The second picture was after painting the metal flake red over the prior prep.
I'm going to let it cure til next weekend and then I'll mask off the center section and paint it black and let that cure and then apply gloss coat.
I'm just getting started but I'm trying to go for a look similar to this, which was done by Rajunz, using adhesion promoter/Testors metal flake blue. I'm not sure if I want my 5.7L V8 to be chromed or red so I painted it red for now. I'll mask it off when I paint the center black.