we just herculinered the interior of my buddy's S-10. it turned out great. we used a wire wheel brush attached to a drill to do all the sanding. i don't think a scotch pad or sand paper is going to get the job done. i suppose it could, but it will take a lot longer and will be a lot harder to do. and you want to use xylene to wip down the interior before applying.
as long as the surface is properly prepped, herculiner will adhere to plastic, rubber, metal, fiberglass, wood, concrete, etc.