427tom- that spray in bedliner has to adhere to metal- not duct tape or felt. It also has to be able to handle the heat when they spray it in. I took my blazer in and they said it wouldn't stick to the rust and I would need to sandblast all the rust off AND they wanted me to sign a release waver "in case" it ruined my new paint! Screw that. I used a grinder on the rust and sanded the entire tub of the blazer and used herculiner roll on liner....worked and looks great! I say if you can fix the bed right and use spray in or roll on liner....you won't regret it. Good luck to ya!
Diane
Here is the before and after pics...
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