I’d rarely take the trouble to review something as mundane as a polish, but it’s comfortably the most impressive one I’ve used. When worked in with moderate effort, this compound will delete superficial flaws in a guitar’s finish - no exceptions. I’ve used it to restore two 25+ year-old vintage guitars to something as close as you’d get to an as-new finish without resorting to a respray, using nothing more than a purpose-made polishing cloth - no mechanical polishing tools were necessary. It can’t cover scratches that expose wood (what can?) but it’s capable of restoring hazed gloss finishes to such an extent that it can even highlight crude sanding and bonding beneath a guitar’s finish when viewed through a bright, reflected light-source. In some respects, it could even be deemed as being too good to use on painted surfaces that are poorly-sanded, and this can only be to it’s credit. I can’t comment on the protection it offers, but here’s a top tip; I can advise that any instrument can be kept in good order as long as it isn’t bashed or scraped against any rough or hard surfaces… you’re welcome.