Good Lord, man...chop chop. The last Ya Gotta Regatta was at least four years ago!

On a more serious note, be sure you taper out where the new fiberglass meets the old on the transom so you have a large contact area for the new resin to bond to. You typically want a 10:1 taper (or more) if you can manage it...so if you've cut 1/8" into the glass, you should taper out the seam between old and new about 1.25".