Question: I've been spraying McCloskey Heirloom Varnish for several years. From time to time, it develops small pits. It happened most recently on a mahogany desk. After sanding and applying wood filler and two coats of sealer, I built up coats of thinned varnish. The pits show across the entire top.
-- Richard Everett , Columbus , OH
Answer: I suspect that the wood filler is the cause of th...