Leaky Hull!!

[Blue_Runner]

If it was me, I would fix that crack with glass, and sand then paint.
fillers are nice and will cover the crack, but when you are in the water breaking waves fillers will do little for streanth and just recrack.

I see what you are saying but for a non structural gouge or small crack I think it can be done with filler with little to no likelyhood of recurring due to water pounding. A big crack that would be susceptible to flexing would be more of a worry IMO and I have actually seen those return from using filler.

I am not a glass guy and never will be ;D