I used Crossfire epoxy and acrylic enamel on the frame of my 4t6 with good results. If I were to redo I would use a black or darker primer as it's easier to cover. I've also used tractor paints on trailers and frames with good results. I painted my 4t6 with tractor paint with hardener and am happy with results. It is a cheaper alternative. Pics below
Dan
http://rides.webshots.com/photo/2951450480071274430qeOjmO
