On this "Your Driver's Ed," we’re using fiberglass to fix some rust holes in the trunk of an old car.
A proper fix would include cutting out the panels and welding them into the bed of the trunk, but that would take time and money. Fiberglass offers a quick fix for much cheaper.
A fiberglass repair kit from the store will include everything you need – resin, hardener and a mat. It’s also a good idea to use a pair of latex gloves to protect your hands.
The mixture has to be precise or the fiberglass will harden too fast or it won’t harden at all. Be sure to follow the directions exactly. Cut the mat to be the size you need. Paint a thin layer of the resin mixture, and lay the mat over it. Then carefully paint on the resin mixture evenly until the mat is saturated. Push out air bubbles with your brush.
Once it’s dry you can sand it down and paint it. Don’t use any cups or brushes you’d want to keep – once the resin sets, you can’t get it off.