Yes, TotalBoat Gleam Marine Spar Varnish can be applied to epoxy. Epoxy substrates need to be fully cured for at least 5-7 days prior to any surface preparation or applying varnish. Once cured, the epoxy must be washed with a mild soap and warm water, then rinsed well to remove any possible amine blush, whether noticeable or not. This must be performed even if the epoxy is considered non-blushing or does not appear to have an amine blush on the surface.

Dry the surface completely. Sand the surface with 220-grit or 320-grit sandpaper. A DA (dual-action) sander can help reduce a sense of grain or sanding marks that show a sense of sanding direction. Remove any sanding residue by wiping the surface clean with a clean, lint-free cotton rag wetted with one of the specified cleaner/surface preparation solvents. Allow the surface to dry completely before applying.

For exterior applications, we recommend at least 8 coats of varnish.