Quote: The tech sheets for most Epoxy Primers recommend sanding and recoating with more Epoxy Primer after 7 days.
You can't go wrong doing it this way. Anything less is shortcut. It's not worth risking paint failure/adhesion problems later.
I am redoing a steel tanker truck that I sprayed in 2005. Single stage urethane over epoxy primer. I got lazy and let it sit for weeks and then just scuffed it(epoxy primer) and sprayed the urethane. The urethane comes off pretty easy and has not held up like my other paint jobs where I stayed there(at work) and spray everything wet on wet, like in a 24 hour deal.
