Two years ago I sanded back my mid century table top and refinished with varathane water based polyurethane. I placed a 1 1/2 mm thick clear plastic protector over the top.
This has produced what I presume is a chemical reaction and has completely removed the polyurethane from the table by causing it to stick to the underside of the plastic protector. See photos.
I want to know if there are any remedies to melt the existing polyurethane to spread over the missing blotches without having to sand the finish off again. I had to sand quite a bit of the veneer top first time round and don’t think it will survive another sanding.