Renovation of polyester pool shells – Geneva & Vaud

Is the gel coat on your polyester hull discolored, porous or grainy? Astro Piscines offers resurfacing and hull renovation solutions for pools in the Lake Geneva region.

Over time, limescale is deposited on the walls of your pond. What is thought to be simple discoloration is often a layer of scale embedded on and under the surface of the gel coat. With our professional sanding and polishing service, your hull is restored to its original color, smooth texture and shine.

Astro Piscines works on polyester hulls in the cantons of Geneva and Vaud to restore the aesthetics of your pool.

 

Common problems with polyester hulls

Problem Symptom Our solution
Calcareous deposits whitish, granular surface ✅ Full sanding + polishing
Discoloration Yellowed gel coat, dull color ✅ Complete resurfacing
Loss of gloss Surface rough to the touch ✅ Professional polishing
Porous appearance Micro-roughness on walls ✅ Surface treatment + polishing
Osmosis Sub-surface blistering ⚠️ Diagnosis + orientation
Cracks Star-shaped cracks ⚠️ Diagnosis + orientation
Coque de piscine polyester avec dépôts de calcaire incrustés avant polissagecanton de Vaud
Résultat après polissage professionnel : coque piscine retrouvant sa brillance

Our solution: hull resurfacing and polishing

Diagnosis and preparation

Before any intervention, our technicians carry out a complete diagnosis of your polyester hull. We identify the exact nature of the problem: scale deposits, gel coat wear, surface deterioration, or deeper degradation (osmosis, cracks). This step guarantees a targeted treatment and optimum results – or, if the problem goes beyond resurfacing, a referral to the most appropriate solution.

Complete sanding and polishing

We carry out a complete resurfacing of your hull, with full sanding and polishing. This tried-and-tested process removes encrusted limescale deposits from the walls and undersurface, restoring the original color, smooth texture and shine of your polyester hull.

Our intervention restores your pool to its original appearance, without requiring replacement of the shell – an economical and sustainable solution for villa owners in Geneva, Nyon and throughout the canton of Vaud.

Osmosis, cracks, damaged hull: what to do?

Is your polyester hull showing blisters (osmosis), star cracks or deep damage? These problems are common after 15 to 20 years of use, and go beyond simple resurfacing.

Osmosis: an irreversible chemical problem

Osmosis is a chemical reaction between water and polyester resin that causes blisters to form under the surface of the gel coat. This phenomenon progressively weakens the structure of the hull. An anti-osmosis treatment may be considered, but in many cases, replacement of the hull is more economical and longer-lasting.

Structural cracks

Star cracks or through cracks can result from impact, ground movement or manufacturing defects. Depending on the severity of the damage, a badly damaged hull often warrants a complete replacement.

Our recommendations in the event of an irreparable hull

If the diagnosis reveals that your polyester shell is too damaged to be renovated, Astro Piscines can help you find two long-lasting solutions:

→ Replacement with a new polyester shell

Installation of a new hull in your existing pool. Fast delivery, wide choice of shapes and colors. Link : /en/coque-piscine/

→ Building a concrete swimming pool

Total freedom of shape, depth and size. An opportunity to modernize your equipment.

Limits of hull renovation

This is not possible with polyester hulls, regardless of the supplier:

  • Changing the pool depth
  • Creation of a masonry staircase
  • Change of basin shape

For these conversions, only concrete pools are eligible. See : Structural conversion.

Coque piscine jaunie et gel coat décoloré avec fissures et osmose sur Genève

Yellowed, osmosed or cracked hull? We’ve got the solution.

Service area

Canton of Geneva: Geneva, Carouge, Versoix, Cologny, Meyrin, Thônex, Chêne-Bougeries, Grand-Saconnex, Collonge-Bellerive, Vandœuvres

Canton of Vaud: Nyon, Lausanne, Morges, Rolle, Gland, Coppet, Prangins, Terre Sainte, Aubonne, La Côte

Free diagnosis – resurfacing, new shell or concrete pool

0842 520 520

Feasibility study and free quote

FAQ – Polyester hull renovation

How much does it cost to renovate a pool shell?

The budget depends on the size of the pool and the condition of the surface. Our sanding and polishing service is much more economical than hull replacement. Contact us for a free personalized quote.

How long does the procedure last?

Resurfacing by sanding and polishing usually takes 1 to 3 days, depending on the surface of the pool and the degree of soiling.

My hull is blistering (osmosis). Can you help?

We carry out a complete diagnosis to assess the extent of osmosis. If resurfacing isn’t enough, we can offer you replacement with a new polyester shell or the construction of a customized concrete pool – two solutions we master from A to Z.

My hull is cracked. Should I replace it?

Not necessarily. After diagnosis, some superficial cracks can be treated. On the other hand, if the structure is compromised, we can help you choose a new shell or concrete pool.

Can I change the color of a polyester shell?

Color change requires a new gel coat. If you’re planning a radical change, replacing the shell offers a complete choice of colors with a guaranteed finish.

How often should a polyester shell be renovated?

Professional polishing is recommended every 8 to 12 years, depending on routine maintenance, water quality and exposure to the elements.

How long does a polyester shell last?

A well-maintained polyester hull lasts 20 to 30 years. After that, if repairs become too costly, replacement or concrete is the wisest option.