Fiberglass pools offer durability and aesthetic appeal, but like any investment, they require proper maintenance and occasional repairs to keep them looking beautiful and functioning properly. Many pool owners aren’t aware of the specific care requirements that fiberglass pools need compared to concrete or vinyl options.
Regular maintenance and prompt repairs can extend the life of a fiberglass pool by 25+ years while preventing costly damage that develops when small issues are ignored. Understanding the common problems—such as surface cracks, fading gel coat, and structural issues—helps pool owners identify when professional intervention is necessary versus when simple DIY solutions will suffice.
The maintenance schedule for fiberglass pools differs throughout the seasons, with specific tasks required during spring opening, summer use, and winter closing. Following manufacturer recommendations for chemical balance and cleaning procedures ensures the pool’s surface remains in optimal condition while protecting the warranty.
Understanding Fiberglass Pool Construction and Maintenance
Fiberglass pools offer durability and lower maintenance compared to other pool types, but understanding their construction is crucial for proper care. The unique structure of these pools requires specific maintenance practices to preserve their appearance and functionality.
Components of a Fiberglass Pool
The foundation of every fiberglass swimming pool is the shell, a one-piece unit manufactured off-site and delivered ready for installation. This shell consists of multiple layers that work together to create a strong, flexible structure.
The innermost layer is the gel coat, a smooth, non-porous surface that gives the pool its color and finish. This layer typically measures 0.5-0.8mm in thickness and serves as the waterproof barrier.
Beneath the gel coat lies the structural layers made of fiberglass and resin. These layers provide strength and flexibility, allowing the pool to withstand ground movement without cracking.
The outer layer consists of additional fiberglass reinforcement that protects the pool from external damage. Unlike vinyl pools with replaceable liners, fiberglass pool walls are permanently integrated into the shell structure.
Most fiberglass pools include built-in features such as steps, benches, and swim-outs molded directly into the shell. These seamless components eliminate weak points common in other pool types.
Importance of Regular Maintenance
Proper maintenance of fiberglass pools extends their lifespan and preserves their aesthetic appeal. The gel coat requires particular attention as it can fade or develop spider cracks when improperly maintained.
Water chemistry balance is critical for fiberglass pools. Maintaining pH levels between 7.2 and 7.6 protects the gel coat from deterioration. Chlorine levels should remain between 1-3 ppm to prevent damage to the pool surface.
Weekly Maintenance Tasks:
- Test and adjust water chemistry
- Remove debris with skimmer net
- Brush pool walls to prevent algae buildup
- Clean skimmer baskets
Pool equipment inspection should occur monthly, including pumps, filters, and heating systems. These components ensure proper water circulation and filtration, preventing potential damage to the pool shell.
Avoid using abrasive cleaning tools on fiberglass surfaces, as they can scratch the gel coat. Soft brushes and manufacturer-approved cleaners are recommended for surface cleaning.
Tackling Common Fiberglass Pool Repairs
Fiberglass pools require specific repair techniques to maintain their structural integrity and aesthetic appeal. Addressing issues promptly can prevent more serious damage and extend the life of your investment.
Identifying Pool Surface Damage
Surface damage in fiberglass pools typically manifests as discoloration, roughness, or visible cracks. Owners should inspect their pools regularly, focusing on areas where water meets air (the waterline) and around fittings or steps.
Blistering appears as small, raised areas on the pool surface and often indicates water has penetrated behind the gelcoat. Chalking presents as a powdery residue and suggests surface deterioration from chemical exposure or UV damage.
Dulling or fading of the surface color generally occurs from improper chemical balance or excessive sunlight exposure. This damage is more than cosmetic—it often indicates the protective gelcoat is compromised.
Use a soft cloth to feel for rough patches below the water level, as these areas may not be visible but could worsen if left untreated. Document any findings with photos to track progression over time.
Repairing Spider Cracks and Surface Cracks
Spider cracks appear as fine, web-like patterns on the pool surface while deeper structural cracks follow straighter paths. Both require different repair approaches based on their severity.
Materials needed for repair:
- Fiberglass repair kit
- Fine-grit sandpaper (220-400 grit)
- Marine-grade gelcoat
- Catalyst hardener
- Mixing containers
- Application tools
For minor spider cracks, drain the pool water below the damaged area. Sand the affected surface gently and clean thoroughly. Apply a specialized gelcoat repair compound according to manufacturer instructions, typically requiring a catalyst for curing.
Deeper cracks may require additional reinforcement with fiberglass matting and resin before applying the gelcoat. Temperature conditions significantly impact curing time—optimal repair conditions are 70-85°F with moderate humidity.
Allow repairs to cure completely (usually 24-48 hours) before refilling the pool. Proper curing prevents future delamination and ensures a lasting repair.
Fixing Pool Leaks and Water Level Issues
Consistent water level drops of more than ¼ inch daily likely indicate a leak rather than normal evaporation. The bucket test helps differentiate: place a bucket on a pool step, fill it to match the pool water level, and compare water loss after 24 hours.
Leaks commonly occur around:
- Skimmer connections
- Return jet fittings
- Lighting fixtures
- Plumbing connections
- Structural cracks
Use food coloring near suspected leak areas—if the color gets drawn into a specific spot, you’ve likely found your leak. For plumbing leaks, a pressure test performed by professionals can pinpoint the exact location.
Minor connection leaks can be repaired with appropriate underwater sealants. However, structural leaks in the fiberglass shell typically require professional intervention to prevent further damage to the surrounding soil and pool structure.
Maintaining proper water levels is crucial—never allow levels to drop below skimmer openings as this can damage equipment and affect structural stability.
Top Tips for Gelcoat Care
Gelcoat forms the protective outer layer of fiberglass pools, determining both appearance and longevity. Regular maintenance prevents costly repairs and extends finish life.
Preventive maintenance schedule:
|
Frequency |
Task |
|
Weekly |
Balance water chemistry |
|
Monthly |
Inspect for damage |
|
Quarterly |
Clean waterline |
|
Annually |
Professional inspection |
Avoid abrasive cleaners that can scratch the gelcoat surface—use only products specifically formulated for fiberglass pools. Soft brushes with non-abrasive bristles prevent microscopic scratches that accelerate deterioration.
UV exposure gradually degrades gelcoat. Consider using a pool cover when the pool isn’t in use for extended periods. This not only protects from sun damage but also reduces chemical and water loss.
Address staining promptly, especially at the waterline where oils and debris collect. Specialized waterline cleaners containing mild acids safely remove these deposits without damaging the gelcoat finish.
