Can gelcoat be applied over cured TotalBoat TotalFair epoxy fairing compound, or do I need to prime first?

Gelcoat and other polyester resins have a high risk of being incompatible with epoxy products, including epoxy fairing compounds such as TotalBoat TotalFair.

DO NOT apply gelcoat directly to cured TotalFair, or the gelcoat will not cure properly.

Before applying gelcoat, overcoat TotalFair with an epoxy barrier coat or epoxy surfacing primer, such as TotalBoat TotalProtect or TotalBoat 2-Part Epoxy Primer. The primer must be fully cured and sanded to a coarse grit to accept the gelcoat.

IMPORTANT NOTE: Even though TotalFair is a non-blushing epoxy product, we recommend that you wash cured TotalFair with water and a mild soap before sanding or overcoating, in case there is any amine blush present on the surface.