How To Patch Fiberglass

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Fiberglass is a common material in interior construction. So learning how to patch it is a very practical skill. You can buy pre-assembled fiberglass patch kits that include just about everything you need to do a patch job. Alternatively, you can buy the rest of the products separately. This is a good idea if you already own some of the tools and materials. This article explains what you need for a successful patch job and how to use them. You will then be able to patch all sorts of fiberglass surfaces.

What you Need

A fiberglass patch kit will typically include the fiberglass cloth, resin, mixing stick, tray and plastic putty knife. You will also need painter's tape, sandpaper and cleaning rags. If you already own some of the things in the kit, it is not worth investing in a full kit. Also, the mixing stick and tray can be substituted with just about any plastic device and a paper plate.

Prepping the Hole

First, use extra fine sandpaper to prep the hole. You just want to sand around the perimeter of the damaged spot. This slightly roughs up the fiberglass, creating a surface that the patch will stick better to. Don't over-sand the fiberglass to the point that the color starts to be removed. Clean off the area and then tape a small square around the hole (about 2" on each side of the hole). Then, you need to cut the cloth to a square that is slightly smaller than the taped-off area (about 1" smaller should work).

Applying the Patch

Next, pour a dollop of resin onto the mixing tray and stir it up a bit. Immediately spread it onto the hole as you hold the cloth over it. The resin will hold the cloth in place, but it might get a little messy. Wearing rubber gloves is a good idea because the resin is harsh on skin. Spread the resin as thinly as possible while still ensuring that you have covered the entire piece of cloth. You might need to apply the resin in stages to get full coverage. Let it dry completely before applying the next coat.

The final step is to sand down the patch. This will be time-consuming. The more time you spend perfecting the patch, the better it will look. Patching flat surfaces is very easy, but it can be harder to work on curved surfaces. However, you will still use the same tools and techniques. Fix any small fiberglass holes as soon as you notice them, before they get any bigger.

For building materials, contact a company such as Hatboro Lumber & Fuel Co


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