Exterior wall coating whiskering suffused with white, have a simple and convenient treatment method

Exterior wall coating of whitening and faded paint industry is one of the most common and most common quality defects, damage to the exterior adornment effect is the largest. What can be done to avoid it? The reason of white paint: when there is no covering or covering the varnish is wet when it rains. Treatment: 1. Check whether the bottom because the coating or less leakage by caustic soda bleaching alkali primer. If it is due to the caustic soda to bleach, the project will have to redo. 2. If the whitening is caused by the emulsion is not completely dry, it is a waterproof whitening emulsion initially. When the temperature rises, whitening automatically restored. If it is necessary to quickly restore the original color, exterior wall coating after drying, try to scroll or spray paint. 3. Some whitening is caused by uneven wall paint coating, whitening, this looks like the side. In the face of this situation, you can find a place first, and then spray it on the original flower white dots. After drying, you can see color. If so, you can directly spray it on a large area. Coating is the reason of excessive alkalify: when it rains, the rain will go into putty layer and at the grass-roots level. After the clear weather, water vapor will take these alkaline material coating, the surface forming a layer of white matter. At the same time, the coating of paint due to its high alkalinity could change color and fade. 预防:1。 Eliminate grassroots basicity: mainly for the maintenance of mortar plastering layer. If the cement by adding water 3 - 4 times completely polymerization, the alkalinity will reduce rapidly. If there is no water conditions, rely on natural rain and natural aggregate, the drying time will be longer, at least more than 20 days ( Winter may be more than 30 days) 。 Therefore, mortar plastering layer water conservation is the best method to reduce alkali. Of course, the choice of cement is also very important. The selection of qualified cement is the foundation. 2. In order to eliminate the basicity of the putty layer, mainly choose good quality leveling putty. The putty high hardness, good resistance to water, low basicity ( Ph value is less than 10) 。 At the same time, be bored with child after construction should be timely watering - 1 2 times, make the putty layer completely polymerization hardening of cement, thus reducing the ph. 3. Sealed with coating permeability and good sealing properties and putty layer at the grass-roots level, make alkaline material difficult to through the water vapor permeability in the coating. This is a temporary solution. However, if the permeability and sealing is not good enough, or alkaline putty contains too many alkaline substances ( PH10) , still can appear high alkalinity phenomenon.