I did my 11 Gmc as soon as I drove it home from the dealer and coated everything with FF. My wife got a Gmc a week before me and I didn't do her vehicle. After I saw what was going with my frame, I looked at her car and no issue. I then sprayed about a 4 inch circle on her car's frame and within 6 months the factory coating failed and the metal was rusting. I called FF and they said some frame coatings are affected by Fluid film. Sad when you go to a GM dealer and brand new truck frames are already rusting in several spots. For the cost this is total BS!
