There’s no doubt that fiberglass doors are very strong and durable. However, just like any other material, fiberglass can be exposed to factors that can cause to acquire damages like scratches or cracks. Cracks most especially can make your fiberglass door look unsightly, but fortunately, cracks can be easily repaired with the use of special solutions. When working with fiberglass doors, preparation is important if you are to come up with a smooth finish. It’s actually not too difficult to repair a damaged fiberglass door.


As long as you have the necessary materials needed for the job, you can definitely get the job done yourself. The tool and materials you need for a fiberglass door DIY repair include fiberglass patching fabric, fiberglass mat, resin, grinder, solvent, tape, cutter, and roller. For a step by step guide into repairing damaged fiberglass door, refer below:

Step 1. The first step into repairing fiberglass door is to evaluate the damage. Once the damage needs immediate fixing, you will need to cut the damaged portion out. Use your grinder and cut out the area that has been damaged.

Step 2. After cutting out the damaged glass, clean the hole thoroughly by getting rid of dirt and debris using cleaning solvents. Small particles may prevent the bond from sticking properly when you apply it later on.

Step 3. Next, apply some paste wax around the hole. Once you apply resin to the hole, it will have a tendency to bond with the door’s exterior and create some mess, making your door look ugly. At the same time, screw or tape a waxed backer at the bottom part of the hole to create a stable surface once you begin the patching. See to it that you create a smooth finish so that it matches with the rest of the fiberglass.

Step 4. Get the measurement of the hole and cut a piece of mat and fiberglass fabric based on its size. For best results, use two layers of both the mat and the fabric and layer them up alternately. Four is the ideal number of layers you should use to fill up the hole so make sure you estimate correctly and not lay more than four layers of mat and fabric.

Step 5. Using epoxy resin, secure the fabric and mat inside the hole by patching them up. If possible, use laminating resin since it makes a stronger bond than other types of resin. If you are using a type of epoxy resin that needs a catalyst to harden it, just follow directions provided by the manufacturer. To get rid of bubbles in the resin, run a resin roller on the surface.

Step 6. To finish the job, you will have to remove the wax backer. Check your work for any imperfection and correct them by filling them with gelcoat. You would want the fixed area to be seamless so make sure you sand it down afterwards. Check your work again and perform necessary fixes if needed. Otherwise, your work is complete.