I just put a coat of hi-temp paint on my exhaust manifold, expecting to have an oven to cure it in today. It says it should be cured within 8 hours, by putting it in a non-household oven for an hour at 650 degrees, but not what happens if I wait too long. The oven didn't work out, and now I have a coat of paint I'd rather not have to sandblast off and redo. Is it really necessary to do it within 8 hours, and what kind of fumes are produced that are so harmful you can't do it in a regular oven? Any knowledge/suggestions would be appreciated.