What is the Process of Repairing a Fiberglass Pool?

Swimming Pools Blog

Fiberglass pools are known for their durability and low maintenance, but like any pool, they can occasionally require repairs. Understanding the repair process — from surface scratches to structural concerns — can help you maintain your pool in top condition for years of enjoyment. If you’re planning your pool project from the ground up, DIY Fiberglass Pool Shells can help you understand what to expect as a homeowner.

Common Issues Requiring Repairs

Before diving into the repair process, it’s essential to understand the common issues that might necessitate repairs in fiberglass pools.

  • Surface Scratches and Minor Cracks: Fiberglass pools are resilient, but surface scratches or minor cracks can occur due to heavy impacts or improper installation. For superficial scratches, lightly sanding the area with fine-grit sandpaper and applying a matching gel coat can restore the surface. Minor cracks can be filled with a fiberglass repair kit, available at most pool supply stores.
  • Fading or Discolored Finish: Over time, UV rays and pool chemicals can cause the gel coat to fade or become discolored. A thorough cleaning with pool-specific products can help restore some of the original color. For more significant fading, applying a new coat of marine-grade paint designed for fiberglass pools can rejuvenate the appearance — just ensure the pool is dry and properly prepped before painting.
  • Leaks: Leaks can occur around fittings, plumbing, or through cracks in the shell. Identifying the source is the first step. For leaks around fittings, check and tighten connections or replace seals. For cracks, drain the pool below the leak level, use a fiberglass repair kit to seal it, and test with a hose before refilling.
  • Blisters: Also known as osmotic blisters, these form when water gets trapped between the gel coat and the fiberglass shell. They require surface preparation and reapplication of the gel coat to properly resolve.
  • Bulges in the Pool Walls: Bulges can appear due to groundwater pressure or improper backfilling. Addressing bulges often requires professional assistance, as it may involve draining the pool and correcting the backfill or drainage. For minor bulges, consult a professional before attempting DIY repairs — you can also explore Full-Service Pool Installation if you prefer an expert-led solution.
  • Spider Cracks: These are fine, web-like cracks that appear in the gel coat layer. They’re usually cosmetic and can be repaired with a gel coat repair kit. Clean the area thoroughly and apply the gel coat as directed for a smooth finish.

Step-by-Step Repair Process

Repairing a fiberglass pool involves several key steps to ensure the pool remains in excellent condition.

  1. Assessing the Damage
    • Inspection: Begin by thoroughly inspecting the pool to identify the extent and location of the damage. Check for cracks, chips, and any signs of blistering, bulging, or fading.
    • Professional Assessment: In cases of extensive damage, consult with a professional to determine the best course of action, including whether Full-Service Pool Installation support makes sense for your situation.
  2. Draining the Pool
    • Partial Drainage: For minor repairs, you may only need to drain the water to the level of the damage. Ensure the pool is adequately supported during drainage to prevent structural issues.
    • Complete Drainage: For significant repairs — such as large cracks, extensive blistering, or bulging walls — complete drainage may be necessary.
  3. Cleaning and Preparing the Surface
    • Cleaning: Clean the damaged area thoroughly to remove any dirt, algae, or debris. Use a pool-safe cleaner to ensure the surface is properly prepped.
    • Sanding: Lightly sand the area around the damage to create a rough surface for repair materials to adhere to. This step is crucial for achieving a smooth and seamless repair.
  4. Applying the Repair Material
    • Fiberglass Patch: For cracks and chips, apply a fiberglass patch kit, which typically includes resin and fiberglass cloth. Follow the manufacturer’s instructions for mixing and applying the materials.
    • Gel Coat: After the fiberglass patch has cured, apply a matching gel coat to restore the pool’s appearance. Ensure the gel coat is evenly applied and blends seamlessly with the existing surface.
  5. Smoothing and Finishing
    • Sanding: Once the gel coat has cured, sand the repaired area with fine-grit sandpaper to achieve a smooth finish.
    • Polishing: Polish the area to match the sheen of the rest of the pool, restoring its aesthetic appeal.
  6. Refilling the Pool
    • Refill: Gradually refill the pool, checking for any signs of leaks or issues. Monitor the water level and the repaired area to ensure the repair holds.
    • Balancing Chemicals: After refilling, test and balance the pool’s chemical levels to ensure the water is safe for swimming. (If you’re installing a new shell or reinstalling after major work, see How to Install a Fiberglass Pool Shell.)

Preventive Maintenance Tips

Regular maintenance can help prevent the need for frequent repairs and extend the life of your fiberglass pool.

  • Regular Inspections: Conduct regular inspections to identify and address minor issues before they escalate. Seasonal changes can impact the pool’s structure, so stay proactive.
  • Proper Chemical Balance: Maintain the proper chemical balance in your pool to prevent damage to the gel coat and fiberglass shell.
  • Use Pool Covers: Use an Inground Pool Winter Safety Cover to protect your pool from debris and UV exposure when not in use — a simple step that can significantly extend the life of your pool shell.

Finding the Right Supplies

Knowing where to find quality repair supplies is essential for effective repairs.

  • Reliable Suppliers: Knowing where to buy fiberglass pools can help you find suppliers offering the best fiberglass pool shells and repair materials.
  • Repair Kits: Purchase high-quality fiberglass pool repair kits that include all necessary materials and instructions for effective repairs. Most pool supply stores carry kits suitable for DIY use.

Conclusion

While fiberglass pools are among the most durable and low-maintenance options available, being prepared to handle common repairs can extend the life and beauty of your pool. Many minor repairs — from surface scratches and spider cracks to fading finishes and small leaks — are well within reach of a motivated homeowner. For more complex issues like bulging walls or extensive blistering, consulting a professional is always the wisest course of action.

Regular maintenance, prompt repairs, and investing in quality materials like the best fiberglass pool shells will ensure your pool remains a cherished feature of your home for many years to come. For homeowners interested in a hands-on approach, exploring affordable DIY fiberglass pools is a great place to start.