TIP: Successfully Spraying Varnish or Oil Paint ...
If you spray several coats of varnish one after another, the top surface will dry well before the varnish at the bottom, and this will significantly slow the penetration of the oxygen. The result will be a finish that feels dry at the surface but is still so soft that you can indent it with your fingernail, and it will remain like this for many days or weeks.
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