I’ve had both results with POR15 manifold paint.
Twice I did a set of SBC rams horn manifolds. They were sandblasted, handled with rubber gloves, washed with lacquer thinner and painted with a brush. Then left to dry for a couple days. Both times they flaked off and rusted in less than a year.
I also did a set of RARE ram air manifolds with the same procedure except I baked them in an old electric oven. They are holding up great so far 4 years later. They only have about 1000 miles on them now so time will tell.
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