That Rustoleum "High Heat" 2000 degree paint is one of the best. Stays on, Proven results over years on the mopar exhaust manifolds.
Best to sand blast or media blast things first, no need to prime with high temp primer either. Lots of products are 1000 degress, Rustoleum Claims 2000 degree. It just works, does not flake off.
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Spray on and let the solvents evaporate, dries quick. Install them on the car, fire up the engine and bake it on.
Done Deal . . .