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Hi Paul,
I use the polish on my stainless steel side pipes, so even though they get plently hot, stainless doesn't have the corrosion problems of aluminum. Therefore, I can't say for sure if it will survive the heat a valve cover sees. I would tend to think so though.
One thing I should have said is the surfaces I use 200MPH polish on have already been brought to a high polish with jeweler's rouge and a buffing wheel or NeverDull. The 200 stuff just keeps polished items looking better longer and with less effort than anything I've ever used.
Hope that helps.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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