I promise you that that Line-x stuff, or any other bedliner will just scrape off when you drop the skid on a rock or some other obstacle. Then it will be harder to repair then the old rattle can method.
I checked into a few different liners, including Rhino, and a few other major brands that claim to be the strongest. THere is a big difference between throwing some tools and boxes in a truck bed and concentrating thousands of pounds on your slider and raking it across a sharp rock. I think that its not worth the cost. (to do it right, dont kid yourself, those do it your self liners are not as strong as the sprayed on ones)
If you do it do it right. But I am content in touching up my sliders once and a while to prevent rust.