Re: What causes this in polyurethane varnish?
In my day job I do both spirit and traditional oil based varnishing, mainly brushed on but sometimes French polished in the case of the spirit. I've next to no experience with poly although I once bought a tin to varnish a table. I took an instant dislike to the stuff. They are obviously trying to rid us of the VOC's (understandably). The stuff will obviously work but it's probably a matter of becoming accustomed to it's properties and it's propensity to certain finish problems. All finishes can and do go wrong, perhaps some more than others. There are a lot of alternatives for the home varnisher. Tru oil is a pretty simple product to apply. It's not the hardest finish and is only really suitable for relatively small objects such as table top radios. Some of the boat varnishes such as Epifanes are well established and well regarded, not the cheapest.
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