I’m wondering if you got to Spectrum from the BOAT/US ad that I saw. I completely lost hope of figuring out what would work. I’ve previously posted that MagicEzy’s Oyster White was a good match on my 1983 26C, but it hasn’t been good on my 1987 26U. I think I’m going to try their Cream to see if that works better.
Someone posted in 2011 that they’d had good luck with, “Evercoat Gel Coat Scratch Patch. Color is Buff White Beige. Number 105653. WWW.evercoat.com.” https://nonsuch.discourse.group/u/bob_forman
And there’s also this in 2022 from Paul Miller (Profile - system - The Nonsuch Community Forum):
-- Bob