: As I read this, it sounds like you are digging out a shallow trench on the
: bad side of the plywood, and filling that with glass cloth and resin.

: If that is right, then there are two problems. 1) You'll cut throuh the first
: layer of veneer and expose the middle core of the plywood. That usually is
: not the same color, so you'll have a 1 1/2 inch to 3 inch wide band of
: that color buried under your glass and resin. 2) You'll only be
: reinforcing the inside with your glass cloth. During the construction
: you'll be bending the plywood in such a way that the inside is compressed,
: and the outside is stretched. The glass anad epoxy on the inside is rather
: flexible and compressible. With no reinforcement on the outside you stand
: a chance of popping open the glue line. If you are going to just add to
: one side, you'ld be better off to splice in a piece of wood.Think of using
: a butt block, even a thin one recessed into the joint, and not glass and
: resin, as it will be stronger in that regard.

hi paul

thats the idea i was thinking of, and there's no doubt it would be ugly and therefor no good for inside visible areas. that joint in s&g's just below the seat for example would be a problem but if it worked the deck and areas to the bow or stern would be ok as not so visible.

in reflection on the double cutting, it would cause more damage to the surface veneer to cut upside down, so that operation would be best surface side up then the flip.

the actual technique would require the glass area to be about as stiff as the ply so that it would be at least as stiff as the scarf, if stiffer the bending characteristics would maybe cause a slight problem in extreme curve areas.

the over inlay patch technique(espec w/ a glass line in the joint however puts a struct layer on top and bottom, making it more like a largish spline. the issue then might be what is below the edges of the inlay - but presumably at least 2 veneers - over kill would be to over lap the glass.