MiniCraft has successfully matched the gel coat on a couple of older boats for me. If they have a file on a particular model, you may not need to pay for a custom match.
http://www.minicraft.com/
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1974 23' Tsunami, fully refurbished, custom pilothouse, Hermco Bracket, 250 Etec
1977 23' Sceptre fully refurbished, soft top, I/O
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