This is what I did
I tape off the shiny trim on the edges and middle and also tape off the small areas that the decals will be placed (any textured coating on those areas will interfere with the decal application). I also use a spray can of truck bed liner instead of undercoating. The bed liner is more of a paint and dries well with good durability. If you have any extra pin stripping tape you can use that to cover the shiny edges, easier to do corners and thin so you can get the center strip done without cutting masking tape into thin strips. Good luck and take you time doing it.
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