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Leave a little extra room on the fiberglass gives you a little wiggle room and helps ensure the hole is fully covered. These mesh patches provide an area to place epoxy across the hole of the plastic. Fiberglass patches can be purchased at hardware stores or online. Use a stirring stick to mix the even parts of the epoxy in a bucket or large mixing bowl. A two-part epoxy has a resin and an activator that need to be mixed together to cure. Once it is mixed, it should be very thick and tacky. Wear disposable gloves when working with epoxy, since it may cause skin irritation. Lay cardboard or another disposable liner underneath the plastic, in case it drips through the mesh. Cover the entire area surrounding the hole with a layer of epoxy. Make sure the layers are even so that it dries evenly. It should be thick enough that the fiberglass can stick to it, but not overly thick. There should be enough epoxy so that the entire fiberglass patch sticks to the plastic. Use your hands to push the fiberglass the hole is in the middle of the patch. The excess fiberglass on each side ensures there is enough to cover the hole and will add a smooth transition between the plastic and epoxy. Fiberglass patches are flexible and should conform to the shape of the plastic you are mending. This time as you apply the epoxy, spread it over the part of the mesh that covers the hole. Use just enough epoxy to hide the mesh underneath, but not so much that it is clumpy. You want it to be as close to flush with the plastic as you can. Let the epoxy set on one side of the plastic before transporting the plastic or moving on. As it dries, it will harden and form a solid layer. It takes at least 24 hours for the epoxy to initially cure, though it may take longer in humid climates. Once one side of epoxy and fiberglass has set, apply epoxy to the other side of the plastic and adhere the fiberglass to it. Paint another layer of the epoxy over the fiberglass and let it cure for another 24 hours. This entire process can be done once more with more fiberglass pieces if you need to add more integrity to the plastic. Once both sides of the epoxy are set and dry, you can use sandpaper to smooth any dry epoxy, so it is level with the plastic. Wear a face mask as you sand the epoxy down so you don't breath any dust particles. Epoxy can be painted afterward to match the color of the plastic.
Cut two fiberglass patches 6 inches (15cm) larger than the hole. Mix even amounts of each part of the epoxy in a bucket. Spread a thin layer of epoxy on one side of the hole with a putty knife. Press one of the fiberglass patches onto the epoxy, so that the hole is in the center. Paint another layer of the epoxy over the fiberglass. Let the epoxy dry for 24 hours. Repeat the process on the other side of the hole. Sand the epoxy until it is smooth.