I've found that when painting high temp paint on surfaces that will see elevated temperatures, 1970's stove hood in a park style and various exhaust headers, the metal takes the paint better if it is heated prior to painting. The stove hood was heated in the oven to 200ยฐ between coats because that was the lowest the oven would go. The headers were heated with a small propane torch. As the metal is heated, you can see the moisture cook away. The times I tried painting without heated, I had lots of paint peeling issues.
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Cliff
2011 Four Winds Chateau 23U