my line-x dealer told me $400 and that was with me removing the box. $150 and I would have done it instead of myself. I have the econo spray gun and it works. I sprayed both top and bottom. Don't know if it helps with sound or not, I would say yes, but it's not the end all of solutions. overall worth it.
I used an entire gallon of the Duplicolor with Kevlar in the bed of my Viking. It ended up nice and thick. It helps a lot to keep coolers from sliding around. I've had the best results when applying bed liner to the bottom of the cooler as well. Really stays put with bed liner on both.
i have no clue what brand my sprayin liner is, but my neighbor had it in his truck for 4-5 years, and the place has done it for many years. My Neighbor had no issues, and it still looked great, and im happy with it in the Viking, paid $175, lifetime warranty. I did check Rhino linings, etc, and like above all wanted 200+
Spring 2013 I bought a Rhino lining kit and applied it to the inside of a 15' aluminum boat my self. Talked to the fellow I sold it to and he says its holding up just fine. Cost was less than a hundred for a gallon. If you are doing just the inside of the Viking Bed they offer quarts for even less, which should be plenty.
Just a thought
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