Sealer vs Primer: A Guide for Homeowners

When moving into a new home, the blank walls are like a fresh canvas waiting for your unique style. However, to achieve a flawless, durable finish, it’s essential not to skip the initial steps of surface preparation. 

Two often misunderstood products in the world of paint preparation are sealers and primers. Understanding the difference between these two types can save you time, money, and frustration, especially in Malaysia’s warm, humid climate.

What is a Sealer Paint?

A sealer is a specialised product applied to porous or problematic surfaces before painting. Sealers are essential when preparing walls with powdery finishes, uneven textures, or surfaces prone to moisture. Here’s why sealers matter:

1. Binding Porous Surfaces
   Sealers treat porous walls, such as new drywall or powdery surfaces, by creating a uniform layer that allows the top coat of paint to adhere better. Without a sealer, paint may peel off or look uneven over time.
2. Barrier Protection
   Sealers act as a protective barrier, preventing moisture from seeping into the wall. This barrier is vital in Malaysia’s humid weather, where moisture can lead to issues like mould growth and mildew.
3. Improved Hiding Power
   A sealer also helps hide the original wall colour. For instance, if the wall has a bright or dark base colour, a sealer can create a neutral layer, making it easier to apply your chosen top coat and achieve a smooth, even finish.

Why Use a Sealer?

Using a sealer as part of your coating system can yield several benefits, including:

1. Stronger Adhesion
   Sealers create a bond with both the wall and the top coat, promoting durability.
2. Resistance to Peeling
   In humid climates, paint can peel if not properly adhered. A sealer helps prevent peeling, making the paint job last longer.
3. Smoother Finish
   Sealers are generally thicker than top coats, helping to even out imperfections on the wall surface.
4. Moisture and Stain Resistance
   By sealing the wall, you protect it from potential stains or moisture damage, both common issues in high-humidity environments.

In Malaysia’s humid climate, proper preparation and the right products are essential for durable and long-lasting walls.

For Exterior Walls
Nippon Paint’s recommended coating system, the 1+2 coating system, involves one coat of 8100 Weatherbond Sealer followed by two coats of Weatherbond Ultimate. This combination protects against environmental factors like UV rays, rain, and dirt, ensuring vibrant colours and long-lasting results.

For Interior Walls
Apply one coat of 8200 Premium Interior Sealer to create a strong base, then finish with two coats of Spot-less Plus (Matt or Sheen). This system provides a smooth, easy-to-maintain finish while enhancing air quality and preventing common paint issues like peeling and stains.

Pro Tip: Before applying a sealer, ensure the wall surface is smooth. Fill in cracks or minor imperfections with a skim compound or putty for the best results.

What is a Primer?

While similar in purpose, primers are not exactly the same as sealers. A primer is typically applied to surfaces that need extra adhesion support, such as wood, metal, tiles, and concrete. Unlike sealers, primers are often tailored for use with different surface materials and provide an initial coat that prepares the surface for further painting.

The Key Differences Between Sealers and Primers

1. Usage with Paint Types
   Nippon Paint’s sealers are designed to pair with water-based paints. Primers, however, are primarily used with solvent-based paints and are suitable for various materials beyond just walls, including wood and metal surfaces.
2. Surface Compatibility
   Sealers are generally for porous or chalky surfaces that need binding support, while primers are used to create a foundation layer for surfaces that may otherwise be challenging to paint, like steel or untreated wood.

To achieve a flawless and long-lasting finish, it is important to choose the appropriate preparation layer for your project. A sealer enhances the adhesion of the topcoat on porous walls, reduces moisture damage, and provides a smooth, even base. On the other hand, a primer is ideal for preparing challenging surfaces such as wood and metal, ensuring a durable and even application.

Conclusion

For your next painting project, consider following Nippon Paint’s recommended coating system. This involves applying one layer of sealer as the base, followed by two layers of topcoat for added durability and protection. This method helps your home withstand the effects of Malaysia’s humid weather while delivering a beautifully finished look that lasts.