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Old 1st Aug 2020, 7:14 pm   #37
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Default Re: What causes this in polyurethane varnish?

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So what would I be waiting for? For the layers of poly to be completely cured?
Yes, just leave it for a month then sand it flat (wet and dry used wet is good on a fully cured finish, Halfords do a very good multi pack of loads of grades, end with the finest) and then a final thinned down coat.

It may well take more than a month, if it takes a thumbnail impression at all it's not ready.