Scratch Repair

How to Handle Scratches and Hairline Cracks in Your Fiberglass Pool

A smooth, glossy gelcoat is one of the standout features of a fiberglass pool. While these pools are highly durable, occasional surface blemishes like scratches or hairline cracks can happen. The good news is that most are purely cosmetic and easy to manage.

This guide will walk you through how to handle surface imperfections and keep your pool looking its best for years to come.

Treating Minor Scratches and Scuffs

Light, surface-level scratches in the gelcoat are often simple to fix. These shallow marks haven’t penetrated the top layer and can usually be buffed out with the right tools.

What You’ll Need:

• A fine-grit automotive rubbing compound.
• A soft, clean buffing cloth or a low-speed automotive buffer.

Step-by-Step Instructions:

1. Clean the Area: Thoroughly clean the scratched surface to remove dirt or residue.
2. Apply the Compound: Place a small amount of rubbing compound directly onto the scratch.
3. Buff the Scratch: Gently work the compound into the surface using a soft cloth or buffer in circular motions. Think of it like polishing a car.
4. Repeat if Needed: Wipe the area clean and check the scratch. If it’s still visible, repeat the process until the surface regains its shine.

Tip: Many rubbing compounds are safe to use underwater. Avoid lowering your pool water below the skimmer level, as this will void your warranty.

Understanding Hairline Cracks

Hairline cracks, also called stress cracks or spider cracks, are tiny, shallow fractures in the gelcoat. While they may be noticeable up close, they are purely cosmetic and do not affect the pool’s structure or performance.

Why They Happen:

• Natural stress as the pool settles.
• Temperature changes causing expansion and contraction.
• Minor impacts or dropped objects.
• Gelcoat aging over time.

Should You Worry?

In most cases, no. Hairline cracks don’t cause leaks, weaken the pool, or shorten its lifespan. However, if a crack deepens, grows, or appears near pool fittings like skimmers or jets, it’s best to have it assessed by a professional for peace of mind.

Preventive Care: Protect Your Gelcoat

The best way to handle imperfections is to prevent them. With proper care, your gelcoat can stay smooth and beautiful for years.

• Use Gentle Cleaning Tools: Choose soft brushes and vacuums designed for fiberglass pools. Avoid abrasive pads or wire brushes.
• Be Mindful of Sharp Objects: Keep tools, furniture with sharp legs, and hard plastic toys away from the pool’s surface.
• Balance Water Chemistry: Consistently balanced pH, alkalinity, and sanitizer levels are essential for maintaining the gelcoat’s durability and appearance.

When to Seek Professional Help

If a scratch is deep enough to expose the white fiberglass layer beneath the gelcoat, it requires professional repair. While hairline cracks are typically aesthetic issues, you may also want them repaired by a professional for cosmetic reasons.

Why Professional Repair is Important:

• Specialized Materials: Fixing deep scratches or cracks requires color-matched gelcoat and expert techniques to blend the repair seamlessly.
• Protecting Your Investment: DIY attempts may worsen the issue or result in visible patchwork, which can affect the pool’s appearance.
• Warranty Considerations: Attempting repairs yourself might void your warranty, so always consult a certified fiberglass pool technician.

Have questions?

Although the warranty does not cover scratches and hairline cracks, and we do not handle non-warranty repairs, we remain available to help. For advice or support, contact our fiberglass repair expert at repairs@tallmanpools.com.