If you're just able to feel the metal heat up and not getting any discoloration I'd say you're alright. My thinkin' is if the metal's not turning color, keep on truckin'. The more heat the better.
As far as the Zoop seal goes, I have no FHE with it. From what I've read it's supposed to be good stuff. Post some pic's and let us know how it looks after you use it. Later on.
Steve
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