Can TotalBoat Halcyon be applied over Sikkens Cetol? Eric Boudreau May 28, 2021 13:13 Updated TotalBoat Halcyon varnish should not be applied directly over Sikkens Cetol. Cetol should be removed prior to applying Halcyon. Related articles How often does TotalBoat Halcyon require maintenance coats for exterior applications? Are Cetol and other wood finishes compatible with varnish? What is the full cure time for TotalBoat Wet Edge? What products can be used as a solvent wipe after sanding TotalBoat Halcyon varnish? Can TotalBoat Gleam 2.0 varnish be applied to brass? Comments 0 comments Please sign in to leave a comment.