Hairline cracks are a common issue in both new and old homes, often appearing near windows and doors due to pressure and movement. These small cracks, usually no wider than 0.5 mm, can worsen if left unaddressed.
Water can seep into these cracks, causing paint to peel and encouraging mould or mildew growth, which affects your home’s appearance and the longevity of your paintwork. Let’s explore the reasons behind hairline cracks, how to fix them effectively, and how Nippon Paint’s recommended coating system can help you achieve a durable, long-lasting finish.
In Malaysia’s humid climate, fluctuations in temperature and moisture levels cause materials like paint, plaster, and concrete to naturally expand and contract. Over time, this movement weakens the structural integrity of the surface, resulting in hairline cracks. This is particularly common in areas exposed to direct sunlight, such as exterior walls, or places with significant temperature differences between day and night.
The difference in temperature and environment between the inside and outside of a building can also contribute to cracks. For instance, the cooler indoor environment may cause the wall to contract, while exposure to heat and humidity outside causes it to expand. This stretching and shrinking of the plaster surface can result in hairline cracks.
Hairline cracks are often observed in walls made with lightweight bricks. This is because lightweight bricks contain a higher number of internal pores compared to traditional bricks, which causes them to expand and contract more. The plaster layer applied to these bricks is subjected to additional stress, leading to cracks over time.
Before applying paint to fix hairline cracks, it’s essential to prepare the area properly for long-lasting results. Follow these steps for effective repairs:
Use a screwdriver or utility knife to carefully scrape along the crack, creating a narrow V-shape. This step helps the filler penetrate deeply and bond securely, ensuring a strong repair.
Remove any loose debris, old paint, or dust using a dry brush, vacuum, or cloth. A clean surface is key to ensuring the filler adheres properly.
Let’s break down the steps for addressing hairline cracks, tailored for both exterior and interior walls. Nippon Paint’s recommended coating system, known as the 1+2 coating system, ensures the best results. This involves starting with one layer of sealer to prepare the surface, followed by two layers of topcoat for enhanced durability and a strong, protective barrier. Continue reading as we guide you step by step on how to fix these cracks effectively.
Start by cleaning the crack thoroughly to remove any dirt or debris. For stubborn stains, use a pressure washer. Let the surface dry completely before proceeding.
Apply Nippon Paint CrackREPAIR 1000, a ready-to-use crack filler specially formulated to repair and restore cracks, tiny holes, and imperfections on various surfaces. Use a putty knife to press the material into the crack until it is smooth and level with the wall. This product provides excellent adhesion and durability, making it ideal for both interior and exterior surfaces.
Once the filler has dried, smooth out any uneven areas using Nippon Paint Abrasive Waterproof Sandpaper to create a flawless base for painting.
Apply one layer of Nippon Paint 8100 Weatherbond Sealer. This sealer offers excellent resistance against efflorescence and alkalinity, ensuring a strong foundation for the topcoat. It also enhances adhesion, promotes richer colour appearance, and is suitable for both new walls and repainting projects.
Finish with two coats of Nippon Paint Weatherbond Ultimate. This premium exterior paint is specially formulated for Malaysia’s challenging climate, providing excellent resistance against UV rays, rain, and dirt. With advanced Quartz and Fibra Technologies, it delivers enhanced durability, a tough paint film, and long-lasting colour protection. Allow the first coat to dry completely before applying the second coat for the best results.
Remove any loose particles or dirt from the crack using a brush or cloth. Ensure the wall is dry before proceeding.
Apply Nippon Paint CrackREPAIR 1000, a ready-to-use crack filler specially formulated to repair and restore cracks, tiny holes, and imperfections on various surfaces. Use a putty knife to press the material into the crack until it is smooth and level with the wall. This product provides excellent adhesion and durability, making it ideal for both interior and exterior surfaces.
Once the compound is dry, sand the area smooth using Nippon Paint Abrasive Waterproof Sandpaper to ensure the filler blends seamlessly with the wall.
Use one layer of Nippon Paint 8200 Premium Interior Sealer, formulated to provide excellent adhesion and a luxuriously smooth finish. This sealer enhances the bonding between the surface and the topcoat, while also offering superior resistance to alkaline and moisture. It creates a strong foundation for the topcoat, ensuring a durable and flawless result.
Finish with two coats of Nippon Paint Spot-less Plus. This topcoat provides a smooth, vibrant finish and resists stains, making it easy to maintain in high-traffic areas. It also improves indoor air quality and offers lasting protection, ensuring your walls stay fresh and clean.
Addressing hairline cracks promptly is crucial to maintaining your walls’ beauty and structural integrity. Whether it’s exterior walls exposed to harsh weather or interior walls with small imperfections, using Nippon Paint’s solutions and following the right steps ensures effective repairs and a flawless, long-lasting finish. Proper preparation and painting now will save time and effort later, leaving you with smooth, beautiful walls that enhance your home’s appeal.
Note: The colour shades displayed are indicative and not precise representations of our actual paint colours.
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