: Has anybody used Carbon or Kevlar tape to tape the seams on a S&G kayak.
: Would it make for a stronger joint, any disadvantages.?

The joints made with glass cloth are far stronger than the surrounding wood. It seems foolish to spend more money for the more expensive carbon/kevlar materials. Carbon fibers running the length of the boat might be thought of as adding additional stiffness, but the shape of the panels contributes far more to the stiffness of the boat. .

: Also on some kayaks (i.e. Squeedunk Cormorant) where the keel panels rise up
: the sides of the kayak at the bow and stern how are theses panels glued to
: the side panels, as there is no corner to make a fillet in (the keel and
: side panels butt together rather that meet to form a corner). I was
: thinking it would be better to apply short lengths of tape between the
: stitches, remove the stitches and then tape over the length of the seam.

You don't need strength running the length of the boat, what you need is adhesion to keep the sides of the boat attached to the deck and bottom of the hull -- basically, you pull the panels together and have to glue them in place to keep them there. Fillet or not, the width of the tape over the joint is the mechanism that does most of this. Each of the twisted wires can provide about 20 pounds of force in pulling the panels together. but every square inch of glass cloth with epoxy resin has the strength to resist hundreds (or thousands) of pounds. You could probably hold the thing together with epoxy resin and a few 1/16th inch wide strips of glass fabric placed near the ties, but why bother?

If you do not want to trap wires under the glass tape, son't use wire. Instead use nylon fishing line, or cable ties. After you apply the glass tape to one side, and it has hardened, you can snip the ends of the cable ties or fishline, and pull the parts before taping the other side. Fish line would be nearly invisible even if you left it in.

: Does this make sense to anyone??

Unfortunately, yes. We addicts all talk and think like this.

Sounds like you are trying to improve on things. That's good! Unfortunately it could take you longer, and delay you from starting on your next boat -- and we all know that someone who worries this much about fillets is definately hooked on the hobby.

Hope this helps.

PGJ