Can TotalBoat Gleam 2.0 be applied to a concrete substrate? Eric Boudreau June 17, 2022 13:34 Updated It is not recommended to apply TotalBoat Gleam 2.0 varnish to concrete substrates. The inherent moisture that concrete constantly emits may cause the varnish to delaminate from the substrate. Related articles Can TotalBoat Gleam 2.0 or TotalBoat Lust spar varnish be applied to shellac? What is the full cure time of TotalBoat Gleam 2.0 varnish? Can TotalBoat Wood Honey be applied over an epoxy surface? Can TotalBoat Halcyon be tinted? Can TotalBoat Wood Honey be applied over wood stain? Comments 0 comments Article is closed for comments.