Primer

I use SPI (Southern Polyurethanes) epoxy as a first coat on bare metal, and also as a sealer. You just mix it thinner to spray as sealer. You don't have to sand epoxy sealer before spraying base coat, as long as you start the base coat within the working window of the epoxy. I just check it for nibs or bugs, tack it off, put on my meth lab suit and respirator and go to spraying base! Good luck to you. :)

Automotive Refinishing | United States | Southern Polyurethanes