Fibreglass pools are popular for good reason. They are smooth, durable, attractive and generally easier to maintain than many older concrete pools. But like any outdoor feature exposed to water, chemicals, weather and regular use, they can still develop problems over time.
Some issues are minor and mostly cosmetic. Others can point to deeper structural, installation or water chemistry problems. Understanding the common types of fibreglass pool repairs can help you spot early warning signs and get the right help before the damage becomes more expensive.
Here are some of the most common fibreglass pool problems, what causes them, and when it may be time to call fibreglass pool repair specialists in Perth.
Surface Cracks
Small cracks in a fibreglass pool surface can be worrying, but not all cracks are the same. Some are cosmetic cracks in the gelcoat layer, while others may indicate deeper movement or structural stress.
Gelcoat cracks often appear as fine lines on the pool surface. They may be caused by age, impact, poor installation, ground movement, manufacturing defects or stress around corners, steps and edges.
While small surface cracks may not always mean the pool is leaking, they should still be inspected. If water gets behind the surface layer, the damage can worsen over time. A professional can assess whether the crack is cosmetic or whether a more involved repair is needed.
Gelcoat Fading and Discolouration
The gelcoat is the smooth coloured surface layer of a fibreglass pool. Over time, it can fade, dull or become patchy. This is often caused by sun exposure, chemical imbalance, age, harsh cleaning methods or poor water maintenance.
In strong sunlight, especially in exposed backyards, pool surfaces can gradually lose their original colour and gloss. Incorrect chlorine levels or poor pH balance can speed this up. Some areas may become chalky or rough, making the pool feel older than it really is.
Depending on the condition of the surface, repairs may involve polishing, resurfacing or applying a new finish. The earlier the problem is addressed, the easier it may be to restore the pool’s appearance.
Osmosis Blisters
Osmosis is one of the more common issues people associate with fibreglass pools. It usually appears as small bubbles or blisters on the pool surface. These blisters can form when water passes through the gelcoat and reacts with materials beneath the surface.
Over time, this can create pressure under the gelcoat, causing raised spots or blisters. Some may be small and isolated, while others can spread across larger areas of the pool.
Osmosis does not always mean the pool is beyond repair, but it should be assessed properly. Repairs may involve draining the pool, removing affected areas, drying the surface, treating the damage and refinishing the pool.
This is not usually a simple DIY job. Professional fibreglass pool repairs are recommended because the underlying cause needs to be dealt with properly, not just covered over.
Leaks
A leaking fibreglass pool can be stressful because the source is not always obvious. Water loss may be caused by cracks, damaged fittings, faulty plumbing, skimmer box issues, return jets, lights or pipework outside the shell.
Before assuming the pool shell is the problem, it is important to rule out normal evaporation. Hot weather, wind and heavy use can all cause water levels to drop naturally. However, if the pool is losing more water than expected, or the water level keeps falling below a certain point, a leak inspection is worthwhile.
Professional leak detection can help identify the source without unnecessary digging or guesswork. The repair will depend on whether the issue is in the shell, fittings or plumbing.
Loose or Damaged Pool Fittings
Fibreglass pools rely on fittings such as skimmer boxes, return jets, lights, drains and pipe connections. Over time, these areas can become worn, cracked, loose or poorly sealed.
Because fittings pass through the pool shell, they are common points for leaks. Movement, age, impact, poor installation or degraded seals can all cause problems.
If you notice water loss, staining around fittings, cracks near jets or movement around the skimmer box, it is worth having the area checked. Repairing fittings early can prevent water from getting behind the shell or into surrounding ground.
Staining
Stains on a fibreglass pool can come from several sources. Leaves, metals, minerals, algae, dirt, sunscreen, chemical imbalance and organic debris can all leave marks on the surface.
Some stains sit on the surface and can be treated with the right cleaning process. Others may penetrate deeper or be linked to water chemistry issues. Metal staining, for example, may be caused by iron or copper in the water, while organic stains are often caused by leaves or plant matter sitting on the pool floor.
Using the wrong cleaning product can make stains worse or damage the gelcoat. If stains are stubborn or spreading, it is best to get advice before scrubbing aggressively or adding strong chemicals.
Rough or Chalky Surface
A fibreglass pool should feel smooth underfoot. If the surface becomes rough, chalky or uncomfortable, the gelcoat may be breaking down.
This can happen due to age, chemical imbalance, long-term sun exposure or incorrect maintenance. A rough surface can also make it easier for algae and dirt to cling to the pool, which creates more cleaning work.
Depending on the severity, the pool may need surface restoration or resurfacing. This can improve both the appearance and feel of the pool.
Delamination
Delamination occurs when layers of the fibreglass separate. This can create bubbles, soft spots, raised areas or sections that feel different underfoot. It is more serious than basic surface fading and should be inspected by a professional.
Possible causes include manufacturing issues, water penetration, poor previous repairs, incorrect resurfacing or long-term stress on the pool shell.
Delamination repairs need to be handled carefully because simply patching the visible area may not fix the underlying problem. The damaged section may need to be opened, dried, reinforced and refinished.
Damage from Ground Movement
Fibreglass pools are designed to be strong, but they still rely on proper installation and stable ground support. If the soil shifts, settles or expands, it can place pressure on the pool shell.
Ground movement may cause cracks, uneven edges, plumbing leaks or stress around steps and corners. Poor drainage around the pool can also contribute to movement, especially if water builds up around the shell.
If you notice new cracks, sinking paving, gaps around the pool edge or changes in water level, it is worth investigating early. The repair may need to address not only the pool surface, but also drainage or support issues around the pool.
When Should You Book Fibreglass Pool Repairs?
You should consider professional fibreglass pool repairs if you notice cracks, blisters, leaks, rough surfaces, fading, staining that will not shift, damaged fittings or signs of movement around the pool.
It is especially important to act quickly if the pool is losing water, if cracks are growing, or if the surface feels soft, raised or unstable. These signs may point to issues that can become more expensive if ignored.
A professional inspection can help determine whether the problem is cosmetic, structural, plumbing-related or caused by water chemistry.
Get Problems Checked Before They Spread
Fibreglass pools can last for many years, but surface damage, leaks, osmosis, cracks and fitting issues can still occur. The key is to understand what causes these problems and deal with them before they become more serious.
If your pool has blisters, fading, cracks, leaks or rough patches, professional fibreglass pool repairs can help restore the pool and protect it from further damage.
A well-maintained fibreglass pool should be smooth, comfortable and enjoyable to use. With the right care and timely repairs, you can keep it looking good and performing well for many seasons to come.
