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Re: LifeCaulk vs. 3M 4200
But you do have a deck core (I assume) and water can run inside that. So it's possible.
That said, chainplates are high on the list of things that leak on a boat given the geometry and the amount of flexing they do. So if you have a chainplate leak it probably really is the chainplate. But you never know.
Also, what about those screw holes? A leak in the screw hole could come out the chainplate inside.
In principle, it could be the deck. But what are the chances that it leaks JUST around the two chainplates?
The screws do not go through and they are potted in epoxy.