Several questions, corrections - not important to this discussion, but you can layer Opti-Coat Pro as well as Gloss-Coat (we do not recommend more than 3 layers), additional coats DO NOT increase durability but insure complete coverage and some believe amp the gloss. Why has no one duplicated Dr G's SiC formula (that I know of), no idea, but the knock on OCP was lack of gloss/slickness that customers seem to desire. Gloss-Coat and OCP+ have Si02 components that add those characteristics. It may be that they can't duplicate Doc's formula or that it's more expensive/troublesome, or are satisfied with what they have. Detail Mutant is accurate is product use estimates, though it depends on the installer and what is coated. We recommend coating plastic, vinyl, glass, metal, etc. One towel should be enough and the applicator pad/towels can be washed (dish detergent/Power Clean) and reused infinitely. FYI, you are not "removing" Gloss-Coat, simply distributing it evenly - no pressure on the towel.