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David Stanford

I am sure tongue and groove would be stronger if a good tight fit. It might also compensate for any slight imperfections on the adjoining edges, if there are any.

I think the PU glue used on the rudder was Wurth. However I have subsequently used this one with similar results:


The PU glues seem to work best on tight fitting surfaces. Epoxy may have better gap filling qualities.

Hope that helps.