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 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? What are the differences between TotalBoat Gleam 2.0 Varnish and TotalBoat Lust Varnish? Is it OK to apply TotalBoat Gleam 2.0 varnish on top of Minwax® stain? Comments 0 comments Please sign in to leave a comment.