Watermark issues

When it rains or water is sprayed on the walls, water stains will appear along the flow of water on the paint film, which cannot be wiped off. This is most commonly seen with matte paint films, or in another case, it may be water stains from leaks inside the house, such as seepage on the ceiling. This is considered a common problem for homes during the rainy season.

Causes

• Matte paint films contain surfactant additives that, after the paint has dried completely, may leave a waxy residue on the surface of the film. When exposed to water, this results in water stains on the film.
• Leaks from various points in the house, such as the roof or terrace, can cause water stains to flow down or seep, resulting in water stains on the ceiling.
• Exterior house paint that has begun to deteriorate is more likely to attract dust. When it rains, that dust mixes with the water and flows down, creating water marks on the walls.

Problem Analysis

• In the case of exterior walls, try spraying water on the problematic wall and wait for it to dry to observe whether water stains appear on the wall. If water stains still appear, it indicates a problem caused by the paint film, and repainting is necessary.
• In the case of interior walls or ceilings, it is essential to identify the source of the water. Is it from rain splashing? From leaks? Or other sources? This information will be used for further repairs.

Solution Guidelines

Water Stains on Exterior Walls

• Clean and prepare the surface with a high-pressure water jet, then leave the surface to dry completely.
• If the existing surface is deteriorated, peeling, blistering, cracked, or has mold and mildew, these issues must be addressed first.
• After that, apply one coat of primer. It is recommended to use a white old cement primer, such as Beger B-1700, or multi-purpose primers like Beger B-3100, B-2100, and B-1900, etc.
• Apply a topcoat with acrylic paint, such as Beger Cool Diamond Shield 15, Beger Cool UV Shield, or Beger Cool All Plus for the exterior, with a smooth matte paint film applied in two coats.

Water Stains Inside the House

• Repair the leaking points first. If the leak is from the roof or terrace, you can use Beger Roof Seal Cool waterproofing product to fix it.
• Clean the surface with water stains. If there is mold, apply Beger Mold Free M-001 mold remover once and leave it to dry without rinsing off.
• Apply a primer that can withstand high humidity, such as Beger Pro Quick B-1900, in one coat on the problematic wall or ceiling.
• Apply two to three topcoats of interior paint, recommended Beger Shield Air Fresh Anti-Virus Gold Ion, which is available for both wall and ceiling applications.