I installed it over the non-skid in the cockpit, companionway, on the gunnels, aft lazarettes and captain chair underside and other areas that you walk on when stern in.
APPLICATION INSTRUCTION PREPARATION: 1) Thoroughly clean the boat surface area where SeaDek® marine traction will be applied. A cleaner that will not leave a residue is recommended. An ammonia-based glass cleaner used with a scotch-bright pad is ideal. The area must be completely dry before applying pads. No need to sand the non-skid. Seadek has a self adhesive on the backing so need to apply adhesive.
It can be easily removed and surface cleaned with acetone to remove adhesive (on the Seadek underside) residue for restoring the non-skid ro original condition OR installing new Seadek.
My dealer scanned the areas to be covered, made a template (see attached) for my approval, fabricated and installed it. Cost was very reasonable.
Service life is reportedly 7 years in the hot sun. My Seadek is under bimini cover so should last longer. After 3 years it looks like new.