I know West System sells pigments for their epoxy. Here's a snippet from their website:

Color Pigments WEST SYSTEM pigments are epoxy-based pastes that can be used to tint the epoxy mixture to provide a base color for the final finish system. The colored surfaces also tend to highlight flaws and imperfections. Cured, pigmented epoxy surfaces are not a final finish surface, but require enamel or polyurethane paint systems to provide ultraviolet protection. Add to the mixed resin/hardener at a rate of approximately one teaspoon of pigment to 8 fl. oz. of epoxy approximately 6 oz. of pigment per B group). More pigment will increase opaqueness and mixture viscosity. 501 White Pigment. 503 Gray Pigment.

> I'm going to build a CLC North Bay and I want to know if I can color or
> pigment the Mas epoxy that I will use on the hull. In addition to painting
> the hull, I want to color the epoxy white in order to keep visible
> scratches to a minimum. With my plan, ascratch or abrasion will have to go
> deep before it hits dark wood color. What kind of pigment can I use that
> will maintain the integrity of the epoxy?