Water-based multicolor paint is a new type of exterior decorative coating that can not only be used for energy-saving renovations of new buildings but also for the renovation and decoration of old walls. How should water-based multicolor paint be applied to old walls? Let's learn and share together below:

Old walls are typically made of cement, paint, water-washed stone, brick, etc. The main difficulty and key point in construction lies in the treatment of the base layer, which directly affects the application and decorative effects of water-based watercolor coatings. In actual construction, different treatment plans and construction procedures should be designed according to different base materials. The main construction steps are:

Ensure wall cleaning: Any loose or bulging areas must be thoroughly scraped off. For old paint coatings that are powdery, flaking, and not waterproof, use high-pressure water to wash off the old coating. Walls with oil stains and dust should be cleaned with detergent or alkali solution.

Wash Walls: After cleaning, rinse the walls with clean water to ensure they are free of oil stains, dust, and other impurities.

Repairing Walls: Patch up localized damaged areas, and ensure necessary maintenance is conducted on the repaired walls.

Water-based Paint Application: To enhance the adhesion of the coating film, it is essential to apply a sealing primer on the old wall before the construction. The water-based multi-color paint spraying should only be carried out after the sealing primer has completely dried.

Water-based multi-color paint commonly uses application methods such as brushing, rolling, spraying (including airless spraying), and scraping.

The brushed coating surface is flat and less prone to bubbles, although it has lower efficiency, making it suitable for interior wall decoration.

The roller coating process has high efficiency, the paint film surface tends to form a slight orange peel effect, is prone to bubbling during application, and is particularly suitable for large-scale exterior wall coating.

Spraying is primarily used for applying specialized finishes on products, such as metallic, stone-effect, and embossed intermediate paints. Spraying techniques can achieve a variety of finishes with low material waste and high efficiency.

Of course, there are drawbacks to the spray application process, such as its high technical requirements for painters and its vulnerability to environmental factors. Troweling is a method specifically designed for applying thick coating materials, such as mortar-type floor paints and solvent-free floor paints.