I haven't tested it fortunately but I had a roll of that heavy mill clear paint protection film that I probably got from JC Whitney or someplace. It's not high quality stuff like 3M or Xpel, but intended for rocker panels on trucks and such - probably about 15 - 20 mils. I put 3 layers on the bottom of my
oil cooler scoop where it doesn't show unless you get down on hands and knees. I figure if I ride up on something slowly or take a soft bump it might protect it but won't do anything if I hit the mouth on a high curb or something.