Repairing damaged fiberglass parts is a relatively quick and easy process. You’ll need the following tools and materials: 
- fiberglass cloth
- resin
- sandpaper
- body filler
- squeegee.
Additional tools may include a drill, masking tape, a sander or grinder, and a clamp. These parts can be found in most auto parts or hardware stores.
For your safety and to achieve maximum material performance, carefully follow each manufacturer’s instructions.
In order to repair a puncture, begin by sanding the backside of the damaged part approximately one inch around the puncture. Flip the material over and cover the puncture with masking tape. Cut the fiberglass cloth one inch larger than the puncture in all directions and mix the resin according to the manufacturer’s instruction. Completely cover the cut cloth with resin and place it over the puncture, removing any air that may be trapped. Allow the resin to dry. Remove the tape from the puncture and sand. Next, mix the body filler according to the manufacturer’s instructions. Apply the body filler with a squeegee and ensure the puncture is completely covered. Allow the body filler to dry, sand until it’s smooth, and paint it if necessary.
Depending on the amount of the damage, you may need to repeat the process and add additional layers of fiberglass to reinforce the structural integrity of the part. This method applies to each repair procedure.
In order to repair a crack, first drill a hole at either end of the crack to stop the crack from propagating. Then, follow the same process. Sand the backside approximately one inch around the crack. Cut the cloth one inch wider than the crack, mix the resin, and cover the cloth completely. Apply the cloth to the crack, and remove any trapped air. After the resin has dried, remove the masking tape, mix and apply the body filler so the crack is completely covered. Once the body filler has dried, sand and paint as necessary. The same process can be used to repair a tear at the edge of a part.
These basic repair steps can be applied to damage of almost any size, and can extend the working life of your component.
This text is a transcription of a video by McClarin Plastics, which can be found here or on the McClarin website. For your safety, please consult a professional before attempting any of these steps. Inquiries and concerns should be directed to McClarin Plastics.
