I have used bedliner on the bottom of many cars. One thing I've noticed, and it would be interesting to hear how it works for you is, tape doesn't like to stick to it for me. I usually try to do the bedliner after it's painted, wetsanded, and buffed because of that. Also its hard to get the wetsanding goo off of bedliner because of the texture. Could be specific to the brand I use though.
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