With our sailboat Bj '78, the Holzruder had already suffered badly. Reworked with resin and these GF mats. Very good to process - and we are absolute beginners. Well, franst fairly out, had to work generously with the scissors. The rudder has become perfect. Any time.
The glass fabric was also super cut and glued by me as a bloody beginner to overlay the hole in the dinghy. One should consider that a square meter is fast enough, because you lay several layers on top of each other. The chaotic structure, however, allows you to puzzle even with smaller pieces.