That tells me that the boat has seen some hard water at one time or other.
Need to look at how this happens---it happens from the boat flexing--if it is run off shore--sooner or later it is going to have spider cracks--I have a few in mine--but I do run mine hard off shore and it is expected by me--where they are is a different story.
I have a few in the floor and a few in the upper sides just behind the windows--these are at what I consider a flex point and there is more stress than the rest of the boat. My arch has not even had any stress cracks show around it------YET---LOL
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 88 V-20
200 G2
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