I have a lot of faith in SPI epoxy primer, but it ends with rusty pits in metal. I am a big fan of having my parts media blasted and epoxy primed.
Another benefit of blasting is removing the hard-to-get-to nooks and crannies of all of the pinch welds and lap welds.
However, none of this matters if one is only going for a daily driver type paint job and not a 8-10 thousand dollar paint job.
Carl and his 2 cents


1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission