[mongocanfly]

88...I fell in that same trap...the IH is my 1st down to bare metal and back paint job..
I didnt know about spi at the time..and didnt know much about epoxy either..
But I mistakenly went to a auto parts store for my painting supplies..I knew from reading to use epoxy on bare metal..they gave me 2k high build instead..after I sprayed it on my bare metal, i started seeing rust pop thru it in about 3 weeks..had to resandblast all my parts and start over...this time I went to sherwin Williams auto paint store, and have been well pleased..
Wish I had known about spi at the time, I would have used their stuff..
I'm like Robert, remove the black coating, then you know what you got..
I heard it said if you wipe the black with laquare thinner and it doesnt come off, then its good..if it comes off ,then it needs removed...but I'd rather start with bare metal..
If Robert and John said to smear mayonnaise on it before paint, then I'd probably do it...hahaha