Can you Apply ecoFINISH to an Old Plaster Pool?

Many pool owners wonder if they can refresh their aging plaster pools without tearing them out completely. The answer is yes—but with a major caveat. While ecoFINISH can be part of a successful renovation, it should not be applied directly to old, deteriorating plaster. Instead, the plaster must first be repaired or fully resurfaced before ecoFINISH is applied. Once this crucial prep work is done, ecoFINISH provides a long-lasting, attractive finish that resists chemicals, UV rays, and wear.

Key Takeaways

• ecoFINISH should not be applied directly to failing or soft plaster. The pool surface must be structurally sound.
• Most old plaster pools require replastering or resurfacing before ecoFINISH can be applied.
• Once properly prepped, ecoFINISH delivers a smooth, slip-resistant, and durable finish that can last for decades.

What is ecoFINISH?

ecoFINISH is a high-performance pool coating system made from thermoplastic polymer powder. Applied with a compressed air gun and cured using heat, it forms a tough, smooth, and chemical-resistant finish. It is commonly used for resurfacing concrete, fiberglass, steel, and aluminum pools.

ecoFINISH is known for two main product lines:

aquaBRIGHT – for concrete, plaster, and gunite pools

polyFIBRO – for fiberglass pool surfaces

These coatings offer significant advantages over traditional finishes, such as plaster or paint, including better resistance to staining, chemical etching, and UV degradation. However, the quality of the base surface is essential to its long-term success.

Can ecoFINISH Be Applied to an Old Plaster Pool?

Not directly. While ecoFINISH is compatible with plaster, it cannot be applied to surfaces that are soft, flaking, or structurally compromised. Applying it to deteriorating plaster would result in poor adhesion, bubbling, or complete coating failure.

In most cases, the pool must be resurfaced or replastered first. Once the plaster is restored and fully cured, the ecoFINISH coating can be safely applied on top, forming a lasting bond and delivering the benefits of a modern coating.

Challenges When Applying ecoFINISH to Old Plaster Pools

Fixing old plaster pools with ecoFINISH can be tricky. Cracks and weak spots in the plaster need careful repair before coating.

Structural Repairs Are Often Needed

If the plaster is soft, cracked, or delaminating, ecoFINISH will fail unless those issues are addressed. Contractors must inspect and often recommend full replastering or resurfacing before ecoFINISH can be applied.

Adhesion Problems Can Arise Without Proper Prep

Applying ecoFINISH over poor surfaces leads to bubbles or “soft bumps” under the coating. These indicate trapped air or weak adhesion—both signs the prep work wasn’t sufficient.

Maintenance and Care for ecoFINISH

With proper surface prep and regular water chemistry maintenance, ecoFINISH can last 15 to 20 years or more. Here’s how to keep it in top shape:

• Brush the pool weekly with a soft brush
• Maintain pH at 7.4
• Keep alkalinity between 80–120 ppm
• Avoid abrasive cleaners or sharp tools
• Clean minor stains with baking soda and water

Most ecoFINISH applications come with limited warranties, which vary by contractor and product line.

Conclusion

ecoFINISH is not a shortcut to fixing an old plaster pool—it’s the final step in a full renovation. While it can’t be applied directly to failing plaster, it can dramatically improve the look and longevity of a properly resurfaced or replastered pool.

With its durability, design flexibility, and ease of maintenance, ecoFINISH is a smart investment for homeowners who want a pool finish that lasts.

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