SEM dries quick, 5-10 minutes at most.
It comes in a high build version that's sold both as gray and as black.
I won't touch anything else in a can for a primer. The SEM dries quick, bonds to anything and accepts
any brand of paint without issue. It sands well and lays down nice. When I'm doing something small
and most likely feeling lazy, I use it and skip the R&M primer.
I get it from my bodyshop paint supplier since I haven't found a traditional parts store to carry it. It is also
on Amazon but at a higher price than my local guy.