Can I apply TotalBoat Gleam 2.0 spar varnish to concrete? Annette DiOrio June 27, 2022 16:58 Updated No, do not appy TotalBoat Gleam 2.0 varnish to concrete because it will not adhere properly due to the moisture emitted by a concrete substrate. Related articles What are the differences between TotalBoat Gleam 2.0 Varnish and TotalBoat Lust Varnish? What spray equipment should I use to apply TotalBoat Halcyon varnish? Can I apply TotalBoat Halcyon water-based varnish over dried acrylic paint? Can I apply TotalBoat spar varnish on top of shellac? How long does it take TotalBoat Gleam 2.0 spar varnish to cure completely? Comments 0 comments Please sign in to leave a comment.