Well, every product has its purpose I guess. Some products can serve purposes that they were never really designed for. The purpose of ScratchX and GS27 is to repair minor scratches and remove minor damage like paint swapping. I'm sure SMR could do the same thing and that any product on a PC would do a great job, but I still think that GS27 and ScratchX do what they were designed to do. I would only every try it with any expectation of stunning results on the most minor of problems. Anything more serious than a rub or a scratch from driving to close to a bush should probably be taken care of with something stronger than these.