I had the same problem with my Sumo. Not sufficient coverage of Gel coat causing the resin to show through as a black mark or line.
I couldn't find a fix for the problem, even getting some gelcoat from Pilgrim and scraping out and filling with gelcoat just seemed to cause another black outline of the void just filled.
Not sure there is a fix, Den may come along with a solution or if Marlin tell you what it is I'm sure we would all appreciate an update.
Cheers, John
Madabout-Kitcars.com
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