Quote:
Originally Posted by SimonCh
I feel inadequate now. Are they from your bilge? I was worried it was perhaps caused by a pinhole leak or something?
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On a serious note that is probably growing from damp timber via a leak or crack in the fibreglass. Without digging it out with a grinder youll never know how bad it is. I've seen that type of growth lots of times and i doubt it would grow on the glass itself.
You could clean it up & bury it under more glass & resin to waterproof it or dig in & investigate