Before 3rd coating of epoxy I apply a special glass tape reinforcement from bow to aft over the backbone, outside of the hull. I use 100 mm wide glass tape in one layer, because I’ll coat the whole hull with glass cloth. It will be the 2nd layer of reinforcement.
The designer, Dudely Dix suggested 450 g/m2 biaxial glass cloth for the mast step area, but it can be purchased only in 100 m length roll for outrageous price. Instead of glass I’ve chosen carbon cloth, because I could buy it in the quantity I really need. The resin I use (SR 5550 from Sicomin) is perfectly suited for both the glass clothes and the carbon clothes also.

biaxial carbon cloth
biaxial carbon cloth
reinforces
reinforces
#3
#3