We're working on a few new ideas for fins with some resin colors. Getting inspired by this video and all of the colors that the team is working with here at the shop.
Adding surfboard resin pigments to laminating resin will result in an opaque color effect. This was the original style of color put on surfboards back in the 60's. For polyester applications, add pigment before catalyst and stir thoroughly. If using pigment with epoxy, mix thoroughly with hardener part, then mix the colored hardner with epoxy part.