The problem of rain and whiteness of water in water multicolor coating bothers many customers. In many projects, the effect is very good when the construction is completed. In case of rainy days, the coating appears serious whitening phenomenon. After the rain, the weather is clear, and the whitening phenomenon gradually disappears. What is the reason for the problem of rain and whitening of water in water multi-color coating, and how to avoid the problem of water in water multi-color coating?
1、 Whitening caused by product formula
Some manufacturers in the raw material selection, for latex, protective glue and auxiliaries of the matching of very few considerations, failed to grasp the proportion of all kinds of raw materials, production of products with "congenital" water problem.
Solution:
The main material and top coat of water in water multicolor paint must be made of good quality water resistant and breathable emulsion. At the same time, a suitable product formulation should be determined through long-term and large quantity of water resistance testing.
2、 White water caused by construction
Each product has standard construction process requirements. If the construction is not carried out in accordance with the specified construction requirements reasonably, or in special weather and special environment, it is easy to encounter the phenomenon of water whitening.
1. Before construction, do not brush alkali resistant sealing primer or putty with poor quality. There may be excessive alkali on the wall surface. After the construction of water in water multi-color coating, it will be washed by rainwater. After long-term water absorption, the wall surface will appear alkali and lead to white finish;
2. In the process of construction spraying, uneven spraying or missed spraying will lead to uneven painting of finishing coat. In addition, in the wet rainy season, the wall with more water absorption will also be light, white and inconsistent in color under the action of moisture and dust in the atmosphere.
3. The construction temperature is too low. After the colorful construction of water in water, there will be rainy weather when the paint film is not dry. Rainwater washing will cause part of the wall color to be washed away, so the wall will appear light and white.
Solution:
1. The base surface is not completely dry to avoid water in water main material construction;
2. The main material is not completely dry, and the top coat shall not be painted (the top coat must have good water resistance);
3. Pay attention to the weather. It is not suitable for the construction of water in water multi-color coating in rainy days, high air humidity and low temperature.
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