Quote:

What sort of metal prep do I need to do before I apply the brightside primer?



Some have used rustoleum as a color coat metal primer as it is designed to be applied directly to metal.

Same overall process applies with rolling and sanding in alternate coats with progressively finer grit. Less than 600 grit is more appropriate to shaping the surface or removing product. 600 grit and up is best for knocking down the high points of fully dry paint.

As for the 333, I don't know if it really matters with the primer.