Can a marine spar varnish be applied over lacquer?

Traditional marine spar varnishes can be applied over lacquer that has completely cured. Though lacquer should be through cured in 48-72 hours, it is recommended to allow at least 7 days to cure under proper conditions. Lightly scuff the cured lacquer surface with a gray Scotch-Brite® abrasive pad prior to applying varnish.