Based on painting 2 whole frames (one rattle can, the other automotive paint (color and catalysed urethane clear using a preval sprayer) if there are any bumps or edges in the primer or if it goes through to bare metal it will show up in the final finish. The guide I followed (mostly) was to use metal etch primer on bare metal, then follow with a high fill primer. The idea was then to do a light second spary of contrasting color primer over the high fill and sand until the contrasting color was all gone to ensure even sanding. Didn't follow that 100% and can see where i didn't

have fun with the paint job