Grant Osborne

Fibreglass Pool Repair Tips and Tricks

Fibreglass swimming pools are popular among homeowners for their low maintenance and quick installation. However, like any pool, they can develop cracks over time. Here are some essential tips and tricks for repairing your fibreglass swimming pool to ensure it remains in top condition.

Removing Osmosis

What is a Fibreglass Pool?

Fibreglass pools are large, moulded structures made from resins and fibreglass, coated with a non-porous gel layer. They offer a variety of shapes and sizes to suit different backyard spaces and aesthetic preferences.

Unlike concrete pools, which can take months to construct, fibreglass pools can be installed relatively quickly, often within a few weeks. Once installed, they are surrounded by concrete for stability, ensuring they stay in place and maintain their shape.

A fibreglass pool is renowned for their smooth, non-abrasive surface, which is gentle on the skin and resistant to algae growth, making routine pool maintenance much easier. This makes them an attractive option for many homeowners seeking a hassle-free swimming pool experience.

Signs Your Fibreglass Pool Needs Repair

Hairline Cracks

Hairline cracks, also known as spider cracking, are small, superficial cracks that appear in the gel coating of the fibreglass pool. These cracks are typically cosmetic and do not affect the structural integrity of the fibreglass pool repair itself. However, they can detract from the pool’s appearance, making it look older and less well-maintained than it actually is.

Larger Cracks

While hairline cracks are mainly an aesthetic issue, larger cracks can signal more significant problems. Cracks that are more than 1/8 inch wide or over a foot long might indicate a structural issue, such as a problem with the pool’s foundation.

These larger cracks can lead to leaks, which, if left unaddressed, can cause further damage to the whole pool structure and surrounding area.

If you notice substantial cracks in your fibreglass pool, it is essential to act quickly. Contacting a professional pool repair company for service can help prevent the problem from worsening and save you from costly repairs down the line.

Worn Out Gelcoat In A Leaking Pool

Importance of Fibreglass Pool Repair

Ignoring minor cracks in your fibreglass pool can lead to more extensive damage over time. Small cracks can expand and deepen, eventually requiring more complex and expensive repairs.

Additionally, larger cracks can cause water to leak out of the front pool walls, leading to several issues:

  1. Water Loss: Persistent leaks can result in significant water loss, increasing your water bills and the environmental impact of refilling the pool frequently.
  2. Structural Damage: Water that leaks through cracks can seep into the ground beneath the pool, potentially eroding the foundation. This can cause the pool to shift or settle unevenly, leading to further structural damage.
  3. Chemical Imbalance: Leaks can disrupt the balance of chemicals in your pool, making it harder to maintain safe and clean water. This can lead to additional maintenance costs and effort.

By addressing cracks promptly, you can prevent these problems and ensure your pool remains safe, functional, and visually appealing.

Tools and Materials Required in Fibreglass Pool Repair

Repairing a fibreglass, pool filter requires specific tools and materials to ensure a proper fix. Here is a comprehensive list of what you will need:

  • Electric Disk Sander: For sanding down the damaged area.
  • Diamond Cutting Wheel: To cut out the damaged area.
  • Fibreglass Pool Repair Kit: These kits typically include resin, hardener, fibreglass cloth, and gel coat.
  • Marker: To mark the area around the crack.
  • Putty Knife: For applying bond coat and putty.
  • Clean Cloth: For cleaning the area.
  • Acetone: To remove sanding debris and clean surfaces.
  • Masking Tape: To mask off the repair area.
  • Ribbed Roller: To remove air bubbles from the fibreglass cloth.
  • Paint Roller: For applying gel coat and sealant.

6 Essential Tips for Fibreglass Pool Repairs

1. Drain and Dry the Pool

The first step in any pool repair process is to first dry completely drain the pool completely. Ensure it is dry before starting any repairs.

This allows for a thorough inspection before fixing cracks and ensures that the repair materials adhere properly to the surface. Repairing a dry pool also helps to avoid complications from working underwater, which can be challenging and less effective.

2. Sand the Damaged Area

Using an electric sander, sand down the area around the crack to remove any loose debris residual dust and paint. This step is crucial as it creates a clean, smooth surface for the repair materials to adhere to. After sanding, clean the area with a cloth and acetone to remove any remaining dust and debris. Avoid using manual sandpaper, as it won’t provide the same smooth and even result.

3. Mark and Cut Out the Damaged Area

Using a marker, draw a 10cm border around the crack. Attach a diamond-edge cutting wheel to your sander and cut out the marked area to the depth of the crack. This step removes the damaged material and prepares the area for the repair.

Cutting out a slightly larger area ensures that you address any underlying issues and provide a more secure surface layer for repair.

4. Apply the Bond Coat

Mix the bond coat according to the instructions provided in your pool repair kit. Using a putty knife, apply the bond coat to the pool filled cut-out area, making sure it is smooth and level with the pool’s surface. The bond coat acts as a base layer, filling the crack and providing a strong foundation for the subsequent layers.

5. Apply the Putty

Mix the epoxy with the polyester putty as per the instructions in your repair kit. Apply the putty over the bond coat with a putty knife, ensuring it is evenly spread and smooth. Once the putty is dry, sand it down to create a seamless surface. Clean the area again with acetone to remove any sanding debris.

6. Apply Gel Coat and Fibreglass Cloth

Mask off a 10cm area around the repair with masking tape. Using a paint roller, apply the gel coat to the masked-off area. While the gel coat is still wet, place the fibreglass cloth on top and use a ribbed roller to remove any air bubbles.

Apply another layer of gel coat over the fibreglass cloth and let it dry. Once the gel coat issue the fibreglass product is dry, sand the area lightly and clean with acetone. Finally, apply a sealant to the repaired area and let it dry for 2-3 days before refilling the swimming pool.

Cracks On Fibreglass Pool Edging

How ecoFINISH® Improves the Process

When it comes to repairing fibreglass pools, using ecoFINISH® coatings offers significant advantages over conventional products. Unlike traditional cementitious finishes, which can be difficult and often require a complete remodel or resurfacing for even minor damages, ecoFINISH® coatings provide an easy and efficient repair solution. Minor cosmetic damage can be addressed simply by reheating and melting the material to heal gouges and cuts, restoring the glossy finish.

For more extensive repairs, the ecoFINISH® surface can be cut back around the damaged area, and after the structural repair, the coating is reapplied and blended seamlessly. This flexibility and ease of repair not only save time and money but also ensure the pool’s surface remains vibrant and intact for years to come. The durability and chemical resistance of ecoFINISH® make it a superior choice for maintaining the aesthetic and structural integrity of fibreglass pools.

Repairing Osmosis In Fibreglass Pool

Professional Repair Services

While DIY pool repairs and pool contractors can be effective, they can also be challenging and time-consuming. Achieving a perfect colour match and seamless finish can be difficult without professional expertise and tools. If you’re unsure about repairing your pool or if the damage is extensive, it’s best to seek professional help.


At Eco Style Pools, we offer expert fibreglass pool restoration services. With over 25 years of experience in fibreglass pool repair tips remodelling, maintenance, and repairs, we ensure your pool is restored to its best condition. Our team uses the best solution of high-quality materials and advanced techniques to provide durable and aesthetically pleasing pool repairs throughout.

Proper maintenance and timely repairs are essential to keep your fibreglass pool in excellent condition. By doing proper pool maintenance following these tips and tricks, you can address minor cracks and prevent more significant issues from developing.

However, for complex repairs or if you’re uncertain about the process, contact the professionals at Eco Style Pools now.

Grant Osborne

Grant Osborne, owner of Eco Style Pool Renovations and Blue Stone Pools has been working the pool building and maintenance industry for the over 30 years, bringing a wealth of industry knowledge to the hundreds of projects he has delivered.

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Our experienced team will work with you to find the best solution for your pool, ensuring it remains a beautiful and enjoyable part of your home for years to come. With EcoStyle Pools, you can trust that your pool resurfacing project will be completed with quality workmanship, premium materials, and excellent customer service.