Amart88

I have a 17 sierra, just looked the other day, slight spot of rust where the jack/hoist touches the frame. Seems anywhere the wax coating is disturbed will rust very quickly. I had a 2015 Silverado, got a Krown oil undercoating done. never had any rust for the 2 years I owned it even with winter road salt. I plan to get my new truck done soon. Like already stated, it helps to regularly spray off the undercarriage especially if you live in an area that uses road salt. Highly recommend getting a rust proofing spray done. (not fluid film though as from what I have heard will melt the wax off all together)