I'm not sure how/if heat would affect it but I doubt it will hurt anything.
Yea, I would doubt it too, the floor is barely warm to the touch when fully heated.
I am probably not going to do much welding or grinding in the garage anymore with out blankets. Too many people around have burned down their garages and it makes me nervous. If it was a metal building I might but not a wood frame garage that is attached to my house. As long as the coating can withstand traffic and the occaisional oil spill, that will be good with me!