Have you ever noticed a fine, chalk-like powder rubbing off your painted walls when you touch them? This issue, commonly referred to as a powdery or chalky surface, often occurs with older walls or paint that has been exposed to harsh weather or high humidity for an extended period.
It is more commonly seen on exterior walls but can also affect interior walls in spaces with poor ventilation or moisture problems. This condition is often accompanied by fading, leaving your walls looking dull and poorly maintained.
Powdery wall surfaces can occur for several reasons, and understanding these causes is the first step toward effective prevention and repair:
Low-quality paint often lacks sufficient adhesive or “glue” content to bind the paint film properly. Over time, exposure to sunlight, rain, and humidity can cause the paint’s adhesive properties to break down, leaving behind a chalky residue.
Primer is essential for ensuring paint adheres properly to the surface. Skipping primer or using interior paint on exterior walls can result in premature deterioration. Interior paint is not formulated to withstand outdoor weather conditions and can break down when exposed to sunlight and rain.
Moisture trapped in cement walls can seep into the paint film after application. This moisture reacts with the paint, breaking down its adhesive properties and causing a powdery or chalky surface. High humidity is a common challenge in Malaysia’s tropical climate.
Powdery surfaces and efflorescence can look similar but have distinct causes and solutions. Here’s how to tell them apart:
In summary, powdery surfaces are caused by paint deterioration, while efflorescence is a result of salt deposits from moisture movement within the wall.
Proper preparation and the use of high-quality products are key to restoring and protecting both interior and exterior walls from powdery surfaces. Follow these steps using our recommended coating system to achieve long-lasting results.
Start by thoroughly cleaning the affected walls. For exterior walls, use a high-pressure water jet to wash off all powdery residue, dirt, and dust. For interior walls, wipe the surface with a damp cloth or scrub gently with a soft brush to remove loose material. In both cases, allow the surface to dry completely to prevent moisture from being trapped, which can lead to future issues. Ensure the wall is fully dry before proceeding to avoid moisture being trapped beneath the new paint.
Once the surface is clean and dry, apply a sealer suitable for the wall type:
After the sealer has dried, apply two layers of high-quality topcoat to complete the 1+2 coating system:
In Malaysia’s humid climate, where moisture and harsh weather constantly challenge wall surfaces, investing in the right products and proper preparation is essential. Nippon Paint’s 1+2 coating system involves applying one coat of sealer to create a strong base that protects against moisture and ensures proper adhesion, followed by two coats of topcoat for added durability and a flawless finish. This proven system helps you achieve walls that are smooth, durable, and free from powdery residue, enhancing both the aesthetics and longevity of your home.
Note: The colour shades displayed are indicative and not precise representations of our actual paint colours.
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