I doubt exhaust manifold paint will work. Been there, tried that, had to start over. Last summer I wanted to repaint the two black outer edges of the stove. First I tried High Gloss Black automotive high temp paint (i.e. for exhaust manifolds). It was high gloss only in name (or perhaps in comparison to a rusty manifold). It came out so flat I couldn't believe it. Had to strip it and start over.
Next time I was smarter and painted test spots before painting the real thing. I tested several Rustoleum products before selecting one: Standard Rustoleum, High Performance Rustoleum, Appliance Enamel Rustoleum, and maybe even a High Temp Rustoleum. Interestingly they all had the temp temperature exposure limits, about 200F, if I remember correctly. In the end I ended up going with the High Performance Rustoleum product, because it had the best gloss level. The Rustoleum Appliance Enamel may have also ended up working, but it appeared it was going to take more coats to get a good gloss level, I stopped after 3 or 4 test coats.
So far so good for me with the HP Rustoleum, but then the stove edges aren't exposed to the same heat levels are the cook top itself. In our case when a burner is running the stove edges don't even get warm to the touch. Becuase the cook top is much closer to the flame than the stove edges I cannot advise if a Rustoleum product might work in your case or not. You'd have to check with the manufacturer, or maybe find a way to confirm that the temperature is within the approved limits.
In the end, while not a do it yourself project, I think that Power Coating might be the best option.
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