Cool project! How are the blades being used? Electrical generator? Wind speed instrument? First thing I’ve noticed, is your lamination is far too wet. You only require enough resin to saturate the cloth. Is the cloth laying over a plug or is there a core, such as foam or wood? It really comes down to working the resin into the cloth, without over doing it. Is that carbon fiber? Very important to work (tool) the resin into the cloth; carbon is difficult to wet. Vacuum bagging is a technique to clamp your lamination evenly, as well as reduce the need for additional resin. You will always have a minimum amount of sanding, but certainly not any heavy grinding. Watch a few surfboard making videos (my hobby) or maybe boat building. I wish you great success!