Jasnik

So surprisingly few people have chimed in here. I've got a 2014 GMC Sierra 6.2 CC SLT Max Tow I never used fluid film and in 2016 realized they don't make american cars like the others I've owned. The rust was gross. I live in Michigan and understood why so many trucks are rusted out in 10 years. I FF'd the shit out of my truck and the wax definitely peeled where I poked at it but otherwise it was just stick goop that worked to prevent rust. IF anything, untouched, the FF extended the life though also softened the wax. In 2017 I used a chisel, elbow grease, and brake cleaner and super degreaser by meguiars out of a pressure washer to remove the FF and the wax coat. Then I rust converted it (plexoyl or something, blue/white spray cans) and coated it 3x with flat black enamel paint (rustoleum). After that had dried 100% (it was summer) I put a thick layer of FF on and touch it up 2x a year. This has stopped ALL rust and has worked great. Don't need to wash it - at first this was shady feeling but seriously. The FF - left to it's own - will coat your shit and work. If you have to, for peace of mind, touch it up and thicken it up at will. DEFINITELY 100% without question - spray this shit in your rocker panels, in your doors, on your hinges, and in your cab corners. It will keep them from rotting out from the inside. If you get it on the rubber weather strips they'll warp a little but they are cheap and easy to repair if you don't care to apply with caution. When I bore scoped mine in 2016 there was lots of specs of rust forming which have not changed since I started blasting FF in there. Greasy yep. Smelly, yep. But that goes away after a few days and no one looks inside your doors. Definitely not in your rocker panels.