Join Date: Sep 2002
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Re: Preping and Painting a rusty exhaust manifold
I just re-did a 258 exhaust manifold, here is how:
1) if it is at all used, have a shop re-surface the flange (should be about $20) - this REALLY helps getting a good seal.
2) wire brush it, or sandblast it, or coke soak it.
3) spray on a degreaser, let it sit 5 mins, spray again, scrub, rinse, dry (VERY important to be clean and dry)
4) I used POR15 1400F paint. I got it in color of stock cast iron gray. Final cure happens when you start it up 1st time. put in on with a disposable foam brush. Did 2 coats, results are great. It soaks into the metal.
So far so good. Looks great, and is made to last.
I don't like the BBQ paints so much because the paint is thinner than stuff made for manifolds. It doesn't last as long either (my personal exp.).