Why not go with herculiner or a similar roll on/brush on bedliner. It protects AND covers the surface and it will provide traction which is functional. DO NOT Go with black for the interior or you will bake like a slug in the sun! Herculiner comes in several colors.
_________________________
When I grow up I want to be,
One of the harvesters of the sea.
I think before my days are done,
I want to be a fisherman.