That is a green tint on that Harbou. Most likely that fluorescent Green that Fiberglass Hawaii sells. The Harbour is a Poly, so don’t expect the color to be the same in Epoxy. Call Fiberglass Hawaii in Ventura/Oxnard. They have the best selection of Tints and Pigments of any supply shop. Lowel
I do that color by starting with (Fiberglass Hawaii pigments) yellow add a dab of blue and a lot of white. Mix it really good then adjust. Too blue add a dab of yellow, too dark a dab of white.
Yellow and blue make green, adding the white lightens it. You could do it with green and white too. I don’t have green right now.
I got the color on the fishboard pictured by mixing white / green pigments and Q-CEL and did a foam stain. I wanted to seal and color the blank at the same time.