Epoxies, in general, will cure to a high gloss finish. The best way to achieve a matte finish will be to apply a matte topcoat over the fully cured epoxy. Our WR-LPU is available in matte and our Marine Spar Varnish is available in Satin. Both the WR-LPU and Marine Spar Varnish are specifically formulated to be applied over our epoxy systems, all other topcoats should be tested for compatibility before use.
Sanding the epoxy to de-gloss the surface is not recommended unless more coats will be applied. Breaking the surface through sanding greatly reduces the scratch and mar resistance of the epoxy.