Im welding new rockers on my S-10 the problem is i don’t if i should use weld threw primer or RE? I would think since im going to duplicate the factory spot welds i would want to spray the replacment panel with Weld threw primer. But the inner rocker panel has some surface rust that i wanted to treat with the RE. Do i use a combenation of both or just use the RE. There is no way for me to treat the inside of the rocker once it is welded on. I searched and couldn’e find anything on weld threw primers.