As renters we have no way of installing a new shower door/trim and the old aluminum frame was quite unsightly not to mention leaking. After preparing the surface as instructed I was able to mask off most of the underside of the frame, masking what I couldn't remove from the old sealer and giving at least part of the frame a cleaner look. It held up well in very slick areas, but I had to use some caulk under some of the more heavily pitted areas to get a good seal. All in all a big improvement.