Dave Carnell wrote:
Dave,

Neither fiberglass nor fabrics like Dynel® add significant strength and
the checking problem with BCX pine plywood is insignificant. Tape your
joints inside and out and paint with 100% acrylic latex exterior paint
of your preferred gloss. For more on this and other heresies see:
http://www.angelfire.com/nc3/davecarnell/

Who are you kidding? Perhaps that's true of larger boats with thick wood
skins, but fiberglass adds substantial strength when you're dealing with
light weight, thin skinned boats like canoes and kayaks. This is
especially true with sandwich construction where the core of plywood or
cedar strips is fully encapsulated in fiberglass.