Read a post that indicated when buffing one should avoid generating heat from friction exceeding 100 degrees F. I'm sure there are several variables affecting this generality. Which to me seems low, as many folks were starting with surface temperatures at or over 100 degrees this summer. Some folks perhaps year round.
Ive also been told if you can't hold your fingers on the surface, it's too hot. That's probably around 130 degrees.
Please discuss the various surfaces (metal, plastic, fiberglass) and other variables that affect the safe limits of the generated temperatures when buffing.