From sleek GRP roofing systems to decorative ponds, garage linings, balconies, and even bespoke garden features, fibreglass is used in a multitude of applications across your home. Its versatility makes it ideal for projects that demand strength and visual appeal - while also remaining waterproof, lightweight and remarkably durable at the same time - resisting corrosion, rot and most forms of impact damage.

Whether protecting a property or enhancing its aesthetic value, fibreglass offers long-lasting performance that few other materials can match. And while fibreglass is undoubtedly tough, it still requires the right aftercare to protect against wear, UV damage, and surface degradation over time.

Without proper aftercare, even high-quality GRP can suffer from surface dulling, cracks, and leaks that compromise its waterproof barrier. For most applications, this maintenance is straightforward and inexpensive compared to the cost of repairs or full resurfacing later.

However, the benefits of consistent fibreglass aftercare go beyond longevity...

Well-maintained fibreglass roofs and structures retain their smooth finish, preserve colour depth, and maintain full waterproof performance. This ultimately results in fewer call-outs for emergency repairs and greater peace of mind for property owners.

Neglecting fibreglass maintenance can lead to small, avoidable issues becoming major problems. Ponding water, unchecked cracks, or a lack of re-sealing can cause premature failure and unnecessary expense. Following a regular aftercare plan will help you make the most of your investment and keep your surfaces looking and performing as they should for decades.

In our latest blog, Fibreglass Supplies will lay out the most vital aftercare advice you need to follow to protect your fibreglass project - big or small - practical or purely creative. From inspection through to repair and scheduled maintenance; we'll highlight all the key points and give you useful, step-by-step instructions to implement fibreglass aftercare as quickly, accurately and effectively as possible...

Inspect Your Fibreglass Surface Regularly

Visual inspections are the cornerstone of proper fibreglass maintenance. Every installation, from a GRP roof to a decorative pond or garden water feature, gradually weathers in harsh seasonal conditions. Early identification of cracks, discolouration or trapped water can save you from costly repairs later. Think of it as a quick health check for your home’s protective shell.

Step-by-Step Inspection Guide:

1. Choose a dry, bright day to carry out your fibreglass inspection work so that imperfections are easy to spot.
2. Walk the surface carefully and look for fine cracks, blisters or bubbling that may indicate trapped moisture.
3. Examine joints, trims and edges for signs of lifting or separation.
4. Check for areas where rainwater collects for more than 24–48 hours, as standing water weakens the surface.
5. Take clear photographs of any damage to track deterioration or show a professional if repairs are needed.

Routine checks once or twice a year, ideally in spring and autumn, will help you catch small issues before they grow into serious concerns.

Clean The Surface With Gentle Products

A clean fibreglass surface is not only more attractive but also performs better over time. Dirt, algae, moss and airborne debris can cling to the surface, gradually dulling its finish and trapping moisture. With simple care, your fibreglass will maintain its glossy, waterproof coating and keep your property looking pristine.

Step-by-Step Cleaning Guide:

1. Sweep away loose debris using a soft brush or broom.
2. Mix a mild detergent with warm water - avoid strong chemicals or bleach-based cleaners.
3. Gently scrub the surface in circular motions with a soft-bristled brush.
4. Rinse thoroughly using a garden hose, ensuring no soapy residue remains.
5. For stubborn algae, use a biodegradable GRP-safe cleaner and rinse well.
6. Allow the area to dry completely before walking or storing anything on it.

Avoid pressure washers on high settings and never use wire brushes, as these can damage the protective gelcoat.

Protect Against UV Damage & Weathering

Sunlight, temperature shifts and rain take a gradual toll on fibreglass surfaces. Over time, ultraviolet rays can cause fading, chalking or loss of sheen. Regular application of UV-resistant coatings and careful drainage management will preserve both the colour and structure of your fibreglass.

Step-by-Step Protection Guide:

1. Inspect fibreglass for fading or a powdery texture that suggests UV wear.
2. Clean and dry the area before applying a UV-resistant topcoat or protective wax.
3. Apply the coating evenly using a roller or brush, following product instructions for curing time.
4. Ensure all trims, joints and edges are sealed to prevent water ingress.
5. Check gutters and downpipes to ensure effective drainage and reduce standing water.

A refreshed topcoat every 5 - 10 years helps maintain appearance and waterproof performance in all seasons.

Repair Minor Damage Promptly

Minor cracks or chips might seem harmless but can quickly worsen when left unattended. Moisture infiltration through even the smallest gap can compromise the surface’s integrity. The good news is that fibreglass is one of the easiest materials to repair with the correct approach and products.

Step-by-Step Repair Guide:

1. Identify the damaged area and mark its boundaries with tape for precision.
2. Clean thoroughly and allow it to dry to ensure proper adhesion.
3. Sand the surface lightly to remove loose fibres and rough edges.
4. Mix fibreglass resin and hardener as per manufacturer instructions.
5. Apply resin and a small patch of fibreglass matting to the area, smoothing it to remove air bubbles.
6. Once cured, sand gently for a smooth finish, then apply a matching gelcoat for protection.

Prompt repairs prevent moisture damage, maintain aesthetics and extend the life of the entire fibreglass surface.

Schedule Periodic Professional Maintenance

Even the best DIY aftercare benefits from a professional touch now and then. Experienced fibreglass specialists can detect early signs of wear invisible to the untrained eye, recommend re-coating schedules and ensure your installation continues to meet performance standards.

Step-by-Step Maintenance Plan:

1. Arrange a professional inspection every 3–5 years for long-term peace of mind.
2. Ask your installer or supplier to assess the topcoat condition and drainage performance.
3. Request a moisture check to ensure the fibreglass core remains dry and stable.
4. Have trims and flashings resealed or replaced if any movement is detected.
5. Keep a maintenance record with inspection dates and any remedial work completed.

Working with your original fibreglass supplier or a trusted GRP professional ensures you receive tailored advice and the correct materials for each stage of maintenance.

Conclusion

Fibreglass is built to last, but like any high-performance material, it thrives with regular attention. A little care - cleaning, inspection, UV protection and occasional professional oversight - goes a very long way in preserving its strength and shine. By following these simple steps, homeowners can ensure their fibreglass surfaces remain watertight, resilient and visually appealing for many years to come.

For trusted fibreglass resins, topcoats, tools and repair kits, always source your materials from reputable UK suppliers, such as Fibreglass Supplies, who understand the technical demands of GRP systems. Proper aftercare starts with the right products and ends with lasting peace of mind.