Well in my opinion I'd only use bed liner on solid parts. Since the plastic bends it might flake and crack later. When I did my flares before I used both plastic paint and rubberized undercoating and they worked good. But if you do decide to bed line I'd like to see pics
Depends how fresh the paint is. If it's very recent, even though it looks and feels dry, it takes a while for all the solvent in it to evaporate. Could cause a problem with applying the liner over it. If it's been a couple of weeks or so, just scuff it up real good and shoot the liner over it.
One of the first things I did on ours. And it had factory painted flares.
I took em off to do it, washed, sanded, washed again, multiple light coats of Duplicolor spray liner. Even did the back of the tub. 2 going on 3 years I think, and has held up to a pair of 100+ pound mutts and the wife's driving.
No cracks or chips.
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