Another option (and you never hear of it...) Use silk and yellow glue instead of fiberglass and epoxy/resin.

I have done this on a few wings and it works GREAT. Silk is stronger than fiberglass of the same weight. (10 times the tensile strength of steel!)

On a Altech Tamecat (a specific instance where I dd it...) I applied 3 layers of 10 momme (a silk cloth weight... this is a medium silk scarf weight) silk. First layer 2 inch wide, 2nd 4 inch, 3rd 6 inch. and used yellow glue thinned 50-50 with water. The wing center joint is as strong as can be desired, and I saved weight vs one 3 inch wide strip of 2 oz fiberglass with epoxy.

I still have the wing... though it was severely damaged in a mid-air. Lost appx 6 inches off one wingtip, lost use of one aileron, safely landed the plane. (many many severe bounce landings using it as a trainer... had just about wore out the wingtips anyway) The center joint is still rock solid.