Yeah,, I've done body work for over 20 years. I power washed the area,,let dry overnight. Then sanded the surface to be treated, with 180grit paper,, used a self etching primer on all the area's that cut thru to bare metal, then used the Raptor bed liner kit. It has a urethane hardener to promote the curing. It dries and sticks good. it remains flexible, and deflect damage with out chipping off.
Regular rock guard material that you spray on, is too brittle and over time can chip away, and that's where the water can seep in. I went back out today to button up the loosed ends, like rear wheel moldings and mud flaps, then Got under the rig, with a 3M Rust Proofing in a few rattle cans, this type leaves a waxy slimy oily, type of coverage, that will ward off salt/water and keep it from seeping into the cracks and crevice's that is where the rust usually starts. The burb is 17 already, and had NO winter weather. So If I can give it another 5 years on a non rusty looking body, then I've done my job. Nothing last forever especially in Michigan! We'll let you know how it does over time.