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One thing you can count on when you save a half-used can of varnish is that the contents will be skinned-over the next time you open the can. When this happens, don't gnash your teeth; the varnish underneath the skin should be just fine. Before
you use it though, be sure to do two things: First, strain the varnish
through one of those paper funnels with a mesh bottom (available at
paint stores), some doubled-up cheesecloth or old pantyhose. This will
get rid of any small bits of dried varnish that are floating around.
Second, try the varnish on a piece of scrap to make sure it dries OK.
If you have any doubt, toss the old stuff out and buy new. It's just
not worth the risk.
Here are some supplies and tools we find essential in our everyday work around the shop. We may receive a commission from sales referred by our links; however, we have carefully selected these products for their usefulness and quality.