Spar varnish applied to exterior logs cracks from winter movement of logs, so is there any benefit as a wood preservative & UV blocker by from cutting oil based stain with spar varnish in a ratio of 1 gallon stain to 1 pint spar varnish?
I wouldn’t recommend it. You will probably mess up the chemical structure of the stain and cause it to fail. If you want the varnish look go with Sikkens Log & Siding.
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