It is said all along the Intertubes, that with Line-X (or any of these types of products), prep is everything. There are supposedly a lot of places that ONLY do a chemical prep and that is not sufficient. The cladding has to be roughed up with sandpaper at the minimum (kinda makes sense). Find a dealer that's willing to do it right. I imagine there are lazy ones that only want to do bedliners, but the good ones spend a lot of their time doing industrial work, so they know how to make it stick.