You can go over it with regular paint, but it will need sanding first.
Epoxy Mastic is very tough and not much fun to sand though!
I went over the 121 on my Sierra with custom epoxy and then 2 pack colour.
http://www.rust.co.uk/filestore/3%20...MARY%20PDF.pdf
Last edited by Mark V8; Sep 7, 2014 at 08:06 PM.