HI David,

It probably doesn’t matter if the rudder is glassed after the gluing.

But it is bad advice. The Everdure (CPES) is basically thinners with a bit of epoxy and does nothing for either the structural repair or preventing rot.

The epoxy glue is much better at that than a thinned down epoxy ever will be. The logical point is that if thinning was good for epoxy strength then we should thin epoxy when we glue structures – we don’t – thus highlighting the error in thinking.

Here is more on the subject.

https://www.storerboatplans.com/faq-info-about-materials-and-methods/qa-epoxy-preservatives-that-soak-into-the-wood-cpes-everdure/?highlight=everdure