Matching the B31 gel coat

[Bulletproof]

I'm getting ready to start filling holes from the removal of my tower and you can imagine there a quite a few. I'm sure the fomula for the gel coat color match has been discussed on many occasions but I wouldn't know where to find them

Is there a source for a pre-mixed Bertram gel coat? Mine is a 1976 hull if that matters.

As always I appreciate this awesome source of info.