5200 below waterline - bad idea?

[CaptScot]

Will 5200 polyureathane release from soaked wood below the waterline? I recently replaced some old non-functioning thru-hull fitting through a cedar planked hull with a taped cedar plug and 5200 to hold it permanently in place. The boat's not yet back in the water. Do I have to worry that these plugs may come out? Perhaps 101 polysulfide sealant is a better choice?

Thanks Scott

[MikeJohns]

Scot
Adhesive strength is dependant on many factors so the answer is not as absolute as you want.

You dont say what the vessel use is, but presuming a sea boat;

If it were my boat I would mechanically fasten those plugs inside if they are now a permanent feature, just a hole and a peg through the projecting part or perhaps a copper plate over the hole if it is flush.

[gonzo]

5200 will delaminate from wet wood. Lifecaulk is a better product for the application.