Can I apply TotalBoat Halcyon varnish over Sikkens Cetol marine finish? Annette DiOrio September 06, 2022 18:26 Updated TotalBoat Halcyon water-based varnish is not compatible with Sikkens Cetol marine finish, and should not be applied over it. Remove the Cetol coating completely before applying Halcyon. Related articles Can I apply TotalBoat Lust varnish on top of TotalBoat Marine Wood Finish? Can I apply TotalBoat FlexEpox adhesive over cured polyurethane paint? Varnish compatibility with different substrates Comments 0 comments Please sign in to leave a comment.