Working With Fiberglass – Tips and Trick

Updated November 19th, 2023
silver fiberglass mat on a roll

Working with fiberglass can be a tricky process. It is important to know the proper techniques in order to avoid any accidents. In this guide, we will discuss the materials needed for fiberglass application, how to use fiberglass, and we will give you some safety tips.

Know the Basics About Fiberglass

Fiberglass is a composite material that is made up of two parts: polyester resin and a fiberglass mat. The resin is the adhesive that holds the fiberglass together, while the fiberglass mat provides strength. It is important to use a respirator to avoid breathing in the fumes, as they can be harmful. In addition, you should wear gloves, long sleeves, and pants to protect your skin.

Materials Needed for Fiberglass Application

Fiberglass is a versatile material that can be used for a variety of applications. To use fiberglass, you will need the following materials:

  • Fiberglass cloth
  • Polyester Resin and Hardener
  • Measuring cups
  • Mixing or paint stick
  • Wax paper
  • Paintbrush
  • Disposable gloves
  • Eye protection
  • Ventilation

Before beginning your project, make sure you have all the necessary materials. You can buy a fiberglass kit that includes poly resin, fiberglass cloth, and hardener in most if the home stores. Once you have gathered everything you need, you can begin.

How to Apply Fiberglass

Safety Gear

When working with fiberglass, you need to wear some safety gear. This will help to protect you from getting hurt. Some of the things you should wear are a long-sleeve shirt, pants, closed-toe shoes, and gloves.

Fiberglass Mold

To work with fiberglass, you will need to prepare the mold. This is a container that the fiberglass will be put in to create the desired shape.

All pieces that will come in contact with the fiberglass need to be clean. This includes the mold, the tools you will be using, and your hands. Any dirt or dust can cause problems with the resin, so make sure everything is spotless before you start working.

Apply wax paper to the inside of the mold before applying the resin. This will help you remove the finished product easily.

Fiberglass Cloth

Fiberglass Cloth

Cutting the fiberglass to cover the mold is a simple process. You will need to use a sharp pair of scissors or a utility knife to cut the cloth. First, measure the area that you need to cover and then cut the cloth to size. Be sure to leave an extra margin around the edge of the cloth so that it can be secured in place.

Hardener and Resin Mixture

Mix the hardener with the resin in a metal bowl with a paint stick according to the instructions. The resin hardener is what will make the fiberglass cure and harden. You should use a respirator when working with the fiberglass, as it can be harmful if inhaled. Be sure to mix them well so that there are no clumps. Stir the mixture well and let it sit for about five minutes.

Place the Fiberglass and Apply the Mixture

Placing the Fiberglass and Applying the Mixture

Once the fiberglass is in place on the desired surface, it’s time for the resin mixture. This is best done with a paintbrush, as it will give you more control over where the resin goes.


Repeat the process of applying the fiberglass and resin mixture until you have the desired amount of coverage.

Coat With Resin

Once you’re happy with the amount of coverage, it’s time to give the whole thing a smooth coat of resin. This will help to fill in any gaps and ensure that the fiberglass is properly sealed.

Remove the Mould and Wax

Once the resin has had time to cure, you can remove the mold and wax paper. Be careful when doing this, as you don’t want to damage the fiberglass.

Tips and Tricks

If you follow some simple tips, you can make the process much easier.

  1. Make sure you have all of the materials you need before you start. This includes fiberglass cloth, resin, catalyst, and a mixer.
  2. Ensure your workshop is well-ventilated insulated. Fiberglass resin is toxic and can cause health problems if inhaled.
  3. Always wear gloves and goggles to protect your hands and eyes.
  4. Be careful when using the resin and catalyst. They can both be dangerous if ingested or inhaled.
  5. Make sure the surface you are working on is clean and dry before you start. Fiberglass will not stick to a dirty or wet surface.
  6. Use a mixer to combine the resin and catalyst until they are both fully mixed together. Do not try to mix them by hand, as this will not be effective.
  7. Apply the fiberglass to the surface in even strokes, making sure it is fully covered. Avoid stretching the cloth too much, as it will become brittle once it dries.
  8. Once the fiberglass is in place, apply the resin over the top of it. Use a brush or roller to spread it evenly.
  9. Once the resin is dry, you can sand it down to create a smooth surface. Start with coarse-grit sandpaper and work your way up to a finer one.
  10. If you want to paint the fiberglass, now is the time to do it. Use a primer designed for use on fiberglass and then paint as usual.

Safety Tips

When working with fiberglass, it is important to take some safety precautions to avoid injuries. Here are a few tips:

  • Wear a respirator to avoid breathing in fiberglass particles.
  • Wear gloves and goggles to protect your hands and eyes.
  • Work in a well-ventilated area.

If you do get fiberglass on your skin, wash it off immediately with soap and water. If you experience any irritation, consult a doctor.

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