You csn sand that fiberdown with some 80 grit and put some bondo on top of it and sand it smooth if you want it to look good. Or you csn just spray over it if you don't care bout it bring like that lol
Fiberglass is relatively easy to do. Just take your time and make sure you use enough resin on the fiberglass mat. Dabbing the resin keeps the air bubbles down. Just don't let it get on your skin or you going to be scratching like a junkie 🤣 🤣.
I aint telling bro what to do but he should have taken the motor out and filter tapped from the inside with a little of foil. Then applied the fiberglass, then the fiberglass strand, then the matt