Good point, re: California-driven solvents. I don't know the answer. Like I said, I don't thin finishes except to thin spar varnish with naptha for top coating. The jugs of mineral spirits, acetone, and denatured alcohol I keep around are mainly employed as de-greasers and for mopping up epoxy squeeze out on glue joints and to de-oil oily woods such as teak and rosewood before gluing them.
