On Dec 31 2007, 1:35 pm, "John Weiss"
Two-part boatbuilders' epoxy (System 3, West System, Mas, or similar) thickened
with wood flour. Get it at West Marine or other marine supply. Stronger than
the wood and similar expansion characteristics. Waterproof, shrink-free, no
noxious fumes; sets in a few hours.

You can use the same stuff to glue the "sistered" boards to the beam, which will
have much more strength than nails alone (probably stronger than the wood
itself).

IMA sailor (BW Harpoon 5.2 1977) thanks.....
I've used plumber's putty (2 part epoxy in a clay form) for some crude
boat repairs.