Hi, I've read great things about the no-fuss durability of spray-on polyurethane clear coats, so I gave it a go on one of my guitars. This was a white strat with a plywood body, which had bog, rattle can primer, rattle can enamel gloss white, then polyurethane clear coat.

The white I used was this: https://www.bunnings.com.au/fiddly-b...paint_p1580053
The polyurethane I used isn't available anymore, but it was a British Paints Polyurethane Gloss spray.

I remember I did at least 3 coats of clear. However after a couple of years intermittent playing, the clear coat has rubbed off quite a lot of the body. Its given me doubts about the durability of polyurethane, but is this just a bad brand of clear spray? Or cheap/incompatible undercoat?