My 2 cents-
Welding- in you weld above the floor about 3-4 feet you should be OK. I have burned this coating while plasma cutting on the floor, but I have burned others I have used as well and expect all epoxy would burn from this abuse. I also noticed that if you don't clean up your slag you will dull the floor with it. (I'm somewhat lazy when it comes to cleaning my garage as often as I should). Eventually after refurbishing the used and abused areas, I now lay a welding blanket down to avoid any un-necessary damage.
On a side note- I was in Indy last year for a car show and some of the guys decided to go visit the Sarges' (NHRA Champion Tony Schumacher) shop. While getting a tour I noticed the epoxy flooring. They have it in the entire workshop, fabrication, assembly areas, even where they park the rigs. I asked some questions about it before asking what they had used. The foreman said they were pleased at how the coating has held up and that they were happy with the performance of it. Since I have experience with epoxy, I asked which brand they used. The shop foreman indicated that is it was UCoat It. Since I have used this before with success, I was excited by the fact that a race shop used the same products as myself and I was able to see it in use in person. It looked better than my floor!
Do a search for UCoat It on this board, and I think you will find a lot of posts about it and other coatings members have used. I like the decal thread by Wardrum (as much for the kick azz Chevy as for the coating info).
