Weld through primer?

68383GTS said
I am going to buy some U POl weld through primer.They sell a zinc rich primer and a copper rich primer.What is the differance between the two?I really didn't see any myself.I am going to be welding body panels.

Thanks,Jim

have a friend who uses the weld thru primer and loves it... never tried it myself but would be worth a try!

also i would go with the zinc because like your epoxy primers it prevents rust...