UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - What causes this in polyurethane varnish?

Uncle Bulgaria · 18th Jan 2021, 4:06 pm

It is a lot of work. Well done for keeping going. It's made marginally easier by keeping patient at the beginning and doing really thin coats, as you've discovered. It's so easy to be a bit too thick because it doesn't look like it's covering, then find out that the next coat's softened the one underneath.

I look forward to seeing your end result!

I wondered why you didn't glue it together first, as surely the joints will require extra treatment as at least some will be visible. Didn't you want to varnish them in situ?

18th Jan 2021, 4:06 pm	#52
Uncle Bulgaria Nonode Join Date: May 2016 Location: Cornwall, UK. Posts: 2,338	Re: What causes this in polyurethane varnish? It is a lot of work. Well done for keeping going. It's made marginally easier by keeping patient at the beginning and doing really thin coats, as you've discovered. It's so easy to be a bit too thick because it doesn't look like it's covering, then find out that the next coat's softened the one underneath. I look forward to seeing your end result! I wondered why you didn't glue it together first, as surely the joints will require extra treatment as at least some will be visible. Didn't you want to varnish them in situ?