I had that with some water-based poly varnish on the small bass cab I made. Started to sand and huge sheets came off, apart from in some areas where it was resolutely stuck really firmly and took ages and a lot of effort to sand off. I have no idea why that happened, except that there are times that the universe really hates you.
Last edited by Simon Barden; 30-06-2020 at 03:46 PM.