Let me toss this in as a .50 shooter. Tracer(in it's various forms) is your biggest fire concern. Strait incindiary (blue tip, API, MK 211) is for starting petroleum type products on fire. They do not burn long enough to start wood on fire. I have WELL over 12k into my .50, not including ammo. I would not waste the time to scrap off paint just to be kicked off the range. Also, I would think that someone that has dropped the $$$ on a .50 would not be an idiot that you would have to watch...however..