I could never get it to match on my own...that is why I had Gel Coat products mix me up a custom batch. http://www.gelcoatproducts.com/custom.html
I took a hole saw, and cut a 1" or 1.25" plug from the an area where the front side seats rest. You can only see the hole when a seat is raised....so who cares. I sent that plug to GCP...and they made a batch to match...or at least close. It was $110 for a quart. I still have a bunch left..but I doubt the Sanger white for a 2000 year boat is the same as you need.
When I realized that the custom batch was too dark, I bought a pint of pure white Gel Coat from TAP plastics. I then mixed the pure white with the custom grey in a variety of ratios:
I found that 3:2 grey to white gave an absolutely perfect match. I then mixed together a batch at 3:2, and used that for all the repair work.
Did you check your color match in the sun? In the sun...the white mismatch really jumps out...
(Message edited by kitewake on June 23, 2009)