Andrew from Thousand Oaks, Ca writes
Powder post beetles are popping up
Boracare is only able to penetrate into raw, untreated, unstained or painted wood therefore it would not penetrate into plywood with varnish on it. You will need to sand down to the raw wood or pull up the flooring to expose the unvarnished underside and treat that.
Answer last updated on: 06/02/2021