I first tried black Duratex on a rack that I built for the scrounged PA from hell. I have subsequently pounded the living bejeebers out of it, with minimal damage. You can cut through it if you try, but it doesn't happen like it does to tolex. As an experiment, I tried coating ductwork in the basement with white duratex during a project to finish parts of the basement into a music room and home office. Not only has it stuck to the galvanized ductwork just fine, it's stayed put, and looks practically brand new five years later. Because it worked so well, I coated some of the rest of the ductwork in the basement with the remainder of the gallon or whatever size it was that I had. I'm in the process of putting plywood on the ceiling to close things off and make the shop a brighter, cleaner place to be, and when that's done, the whole shebang will get coated with duratex. I almost have my wife convinced that I need to coat the walls in the stair down to the basement with it, too. I love this stuff. It doesn't stink when you apply it, and it is tough as nails. I'm sure there's tougher stuff out there, but for my purposes, duratex is plenty strong enough and the fact that it's water based means I don't have to worry about solvents and solvent smells in the house.