This is my first post. Ive got a 2015 Silverado crew cab , when I noticed the wax coat peeling in some areas I looked to the forum. I just want to thank the guys who have said to treat the rust on your own. After a couple hours of wire brushing and applying a rust neutralizer I put rustoleum flat black for a finish cote . I'm glad I did it on my own because I would not have been happy if the dealership sprayed undercote and called it good. I had a 1994 Silverado that rusted to the point that when I put it on a lift at my buddy's garage the truck cracked in half like an egg . The previous owner kept undercoating the frame and I assume the rubber just holds the moisture and creates havoc on the frame. Hoping a little elbow grease a couple times a year will keep it strong and looking good.