Along with my cruiser hobby, i am what might be called a serious home shop machinist. I've rebuilt several machines when i was turned on to two part polyurethane paints. As Brownbear indicated, this stuff is awesome. The main problem with milling machines,lathes, and grinders are the hot chips/sparks that comes with machining parts from steel. The hot chips simply burn/melt into the paint. The stuff is extremely resiliant. Even spilled acid on a pan that had been sprayed. It fizzed and boiled up however it wiped right off with no damage to the paint. The automoivate paint store said they supply this paint to marine applications in our area. EXTREMELY durable. I painted a 550 gallon fuel tank and stand which sits out in our 120degree summers and all winter. It's been over five years and the tank is as shiny as the day i painted it. Downside-spendy. Good luck