I got the gelcoat Webbing done last night in purple and black. The webbing agent is mixed in equal parts with the clear gelcoat, and then you add your pigment. It probably took 4 ounces of gelcoat to do both webbing colors. It is VERY minimal, less than you'd ever imagine. I mixed up almost a pint and had most of it left over. I wish I could have mixed less, but its already tough when you're adding drops of wax and drops of hardener to the pot. Turned out pretty awesome if I say so myself.
Purple first:
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