Re: What causes this in polyurathane varnish?
Humidity is my guess.
I'm a bit of a traditional luddite and would have used French polish. Takes some practice to get it right, but the beauty is if it all goes wrong, you wipe it off with meths and start again. This is relatively easy on small areas like a record deck or radio cabinet. The really skilled specialist polishers are needed for dining table size jobs.
With solvent varnishes, when it goes wrong it is a whole load a grief with sanding it off with potential damage to the veneer.
Sorry it has gone pear shaped - bit late with the French polish method I'm afraid.
Craig
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