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Well, I'm curious now. On advice from another forum, I wanted to coat a set of manifolds with some kind of coating to look like cast iron. It was recommended I use Rustoleum copper metallic spray paint. Spray the manifolds and bake them in an oven for two hours at 400*
They went in the oven looking like copper and came out looking like copper. No change. Looked almost like FTF's manifolds. I was told the heat would changed the copper to a cast iron gray. Didn't happen. So just to make sure I had enough heat on them, I put a torch to them and got them very hot. Still no change or discoloration.
Where did I go wrong?
I don't know. The only requirement for the copper paint I ever heard was that it have a very high metallic content. My memory is the recommendation was for it to be 7% metallic or greater.
Do you still have that Rustoleum can so you can check?