epoxy primer
single stage paint in body color (this is especially important with a light color - the underhood heat can cause clear coat to yellow with time and then it looks out of place because it doesn't match the body)
Take all the metal to bare steel - DA sander and wire brush attachments on an angle grinder and a drill (lots of different sizes and shapes)
wipe it all down with Brakekleen before primer
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This was all done (down from the firewall pinch weld) using 66 Auto Color single stage spray bombs that have a separate hardener unit in the can. It came out great with the metallic, the color and the finish well matched to the body shop's base coat clear coat.
