Cast iron exhaust manifold cleaning
I media blast the manifolds and spray the paint on. I then do a partial cure in my powder coating oven for about 20 minutes. Then the first time on an engine finishes the cure. Follow the instructions on the can. The instructions say DO NOT use glass beads. They leave the surface too smooth for good paint adhesion. I normally use medium grit ground glass. I have done dozens of sets of manifolds with this product, and I have never had a customer bring them back.
ColorGard Cast Iron Grey Exhaust Coating (CHK) | Tech Line Coatings Industries
OK. I will agree that there are some high heat exhaust paints that are OK. I have used quite a few over the years. I have never used POR15 high heat exhaust paint, but POR15 products are quite good. I have been powder coating part time out of my garage for about 20 years. I've gotten pretty good at it. I have found an excellent professional product called Techline Color Guard that works far better than anything else I have ever used. It comes in a cast iron grey that looks just like a brand new exhaust manifold, and stays looking loke that for many years.
I media blast the manifolds and spray the paint on. I then do a partial cure in my powder coating oven for about 20 minutes. Then the first time on an engine finishes the cure. Follow the instructions on the can. The instructions say DO NOT use glass beads. They leave the surface too smooth for good paint adhesion. I normally use medium grit ground glass. I have done dozens of sets of manifolds with this product, and I have never had a customer bring them back.
ColorGard Cast Iron Grey Exhaust Coating (CHK) | Tech Line Coatings Industries