The Gold Standard for Water-in-Water Coating Application: From Flawed Wall to Flawless Finish

HZ info,Water-in-Water multi-color coatings are a popular choice for external wall construction due to their rich colors, realistic stone-like effects, and strong weather resistance.

However, application problems like uneven spraying and color variation often trouble applicators.

To guarantee a perfect final appearance, construction teams must maintain strict control, from pre-application preparation right through to the actual spraying process.

Ⅰ. Substrate Treatment

Treating the substrate is the critical first step to ensure the water-in-water coating sprays evenly.The base wall must meet specific conditions: flatness deviation less than 2 mm, strength greater than the coating’s strength, no contaminants like oil or dust, moisture content below 10%, and a pH value below 10%. If the substrate is uneven or contains impurities, it will cause the coating to be unevenly thick after spraying, negatively affecting the overall appearance and adhesion.

The skim coat application is equally important. When applying the skim coat, ensure it is smooth and even. After drying, sand it thoroughly until it is smooth, with no scratches or pinholes.The skim coat provides an excellent base for the paint to adhere to, guaranteeing uniform coating distribution.

Do not overlook the primer coat. Apply the anti-alkali sealing primer consistently and uniformly—do not miss any spots. The primer seals the substrate’s pores, stopping moisture and alkaline substances from seeping out. It also strengthens the bond between the coating and the substrate, laying the groundwork for successful subsequent application.

II. Material Preparation and Calibration

Precision blending mixing materials requires customization mid coat: Add 5% to 8% clean water and mix at a low speed for 3 to 5 minutes until uniform. Water-in-Water Multi-color Coating: strictly prohibit vigorous stirring. Only gently shake or slowly flip the material to avoid destroying the granular structure. Stir the topcoat thoroughly before use until it is uniform.

Adjusting viscosity to suit the environment. Depending on the ambient temperature and construction requirements, you may add a proper amount of clean water to adjust the viscosity. Crucially, the added amount must not exceed 5%, as this will compromise the coating’s film-forming properties and adhesion.

Select a professional multi-color spray gun. Adjust the gun parameters according to the particle size: control the air pressure typically between 0.6 and 0.8 text MPa. Nozzle diameters commonly range from 3.0 to 3.5 mm. Adjust the fan width to suit the working surface.

III. Spraying Application Techniques: Skill Determines Success

Maintain an appropriate spray distance. Hold the spray gun 30 to 40 cm away from the wall surface. A distance that is too close causes running, while a distance that is too far results in dry spray.

Ensure uniform and stable spraying speed. Move the spray gun at a consistent speed of approximately 0.8 to 1.2 meters per second. Speeds that are either too fast or too slow will negatively affect the spraying result.

Keep the spray angle vertical. Hold the spray gun perpendicular to the wall surface; avoid tilting, which can cause uneven application.

Use reasonable overlap. Each pass of the spray gun should overlap the previous pass by 1/3 to 1/2 to ensure complete coverage and prevent missed spots.

Employ layered spraying. Use the technique of thin coats applied in multiple passes, typically spraying 2 to 3 coats. Allow a minimum interval of 4 hours between each coat.

Use consistent material batching. For a single wall surface, always use products from the same batch prepared at one time to prevent batch color differences.

Ensure continuous application complete the spraying on a single wall surface continuously without stopping in the middle to avoid visible joints or overlaps.

IV. Environmental Factor Control: Must Not Be Overlooked

The construction environment temperature should be controlled between 5 and 35; the optimal temperature is 15 to 30. Temperatures that are either too high or too low will affect the coating’s application performance and drying results.

Air humidity should not exceed 85%; prohibit construction during rainy or windy weather. High humidity causes the coating to dry slowly, leading to issues like blistering and peeling.

Do not apply the coating on walls exposed to direct sunlight. High temperatures cause the coating to dry too quickly, which affects uniformity.

The application of Water-in-Water multi-color coating is a highly technical skill that demands professional knowledge and rich experience from the construction personnel. The key to achieving uniform spraying lies in proper substrate treatment, reasonable material calibration, standardized spraying techniques, and suitable environmental conditions. Only by adhering to these principles can you guarantee the perfect decorative result of the multi-color coating, ensuring the building’s external wall construction is both beautiful and durable.

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