[RocktimusPryme]

1K Spray cans have their place, but Im generally with you.

The asterisk being if you have to sand them. For small projects If I choose to use a rattle primer for convenience I apply the color to it in a wet on wet application.

Ive NEVER encountered 1K rattle can primer that didn't clog the heck out of sandpaper when dry sanded compared to even cheap 2 part automotive primers.

I did recently have adhesion issues with the ceramic engine primer. I cleaned all the bare metal then primed it. Painted it with color (also ceramic rattle can) then used a 2K clear over the top for chemical resistance. Looked great. But I put a little tape down like a month later, and it pulled it all up off the bare metal. Should have used a proper epoxy primer, or an adhesion promotor over the bare metal.