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I'm refinishing an outdoor porch, and laying down exterior-grade marine-quality varnish. On the second application there was considerable mottling in spots--the varnish gathered and wrinkled. Should I let it dry completely and then try to sand it? Still after 24 hours i tried this and it just got muddy.
I think the fact that the varnish was thick enough to wrinkle up would mean it needs an extra-long time before sanding.
Did you clean the deck before you applied the finish?
Thin coats anre much better than thick coats. When you apply a very thick coat the finish has trouble drying then it has even more trouble curing. Stays very soft or sticky forever.