Can I apply TotalBoat spar varnish on top of shellac? Annette DiOrio June 23, 2022 16:35 Updated Yes, as long as the shellac has cured for at least 48 hours, and the surface has been prepared properly, you can apply TotalBoat Lust marine varnish or TotalBoat Gleam 2.0 spar varnish on top of it. Related articles How do I prepare a cured epoxy surface for an application of varnish or urethane? Can I apply TotalBoat Halcyon water-based varnish over dried acrylic paint? How do I clean and maintain a surface coated with TotalBoat Halcyon varnish? What is the full cure time for TotalBoat Halcyon varnish? What are the differences between TotalBoat Gleam 2.0 Varnish and TotalBoat Lust Varnish? Comments 0 comments Please sign in to leave a comment.