Appling epoxy primer to bare metal prior to body filler will aid in the filler's adhesion, durabilily and also add some corrosion protection. A few car manufactors now highly recommended that epoxy be applied to bare metal prior to filler because of those reasons.

Currently working on custom metal and How to videos.

1949 and 1972 chevy trucks
70 chevelle SS455
Pictures of my work and projects
http://community.webshots.com/user/sevt_chevelle