Stone paint crack reason? ？ ？ ？ ？

Stone paint, also known as the stone coating, is one of the types of exterior wall coatings. The effect of it is vivid, texture and color are close to the natural stone material, in addition to a lack of hardness. Stone coating protection, water resistant, acid and alkali resistance, pollution, non-toxic, tasteless, strong adhesion, never fade, etc. It can effectively prevent external environment on the structure of the corrosion, prolong the service life of buildings. At the same time, the stone coating with good adhesion and freeze resistance, especially suitable for cold areas use. At present, the stone coating in villas, commercial and office building has become more and more popular. However, stone coating in construction process prone to fracture. High rain reminds you when construction should pay attention to the following respects. First of all, rock properties of 1. The coating hardness stone paint coating will become very hard, after the construction completion nails can't dig, so as to guarantee the quality of stone coating. 2. Good water resistance of the coating, color stability, without off color, stone coating good water resistance. Even on a rainy day, there is no need to worry about stone paint some quality problems, not white stone coating, without off color. 3. Stone paint with lifelike texture. Unlike ordinary paint, oil paint to create a vivid appearance, and the construction is very convenient. 1 second, the construction technology. Polishing metope in order to ensure the adhesion of paint. 2. Spray primer twice, and then 2 ~ 3 mm thick stone paint spraying; Then spray varnish twice. 3. Construction standards ( 1) Stone painting: choose suitable spray gun, control air pressure in the 4 - 7 kg/cm2, construction temperature above 10 ℃, the thickness of about 2 - 3 mm. If you want to coated with two layers or three layers of coating, the interval between them optimization for 2 hours, and can be polished in dry after 24 hours. ( 2) Polishing: use 400 ~ 600 mesh sandpaper, then gently raised sand grinding really stone paint surface. Be careful not to push too hard. ( 3) Spraying coverage: use spray gun, pressure of 4 - 7 kg/cm2, construction is not less than 10 ℃, spraying twice, about 2 hours, about 30 microns thickness, dry completely needs 7 days. Third, how to prevent cracks 1. In the process of spraying Angle crack of Yin and Yang, Yin and Yang Angle cracks may occur. On-site solution: if there is a crack found Angle of Yin and Yang, spray gun, spraying a thin layer of coating and then spray again every half an hour, until the crack are covered. 2. Cracks appeared on the plane if cracks appeared on the plane, may be because the weather temperature difference is big, suddenly became cold, the inner and outer drying speed is different. The solution: use small nozzle spray gun, thin coating layers, then try to control the drying rate of each layer. The best spray again. 3. When cracks appeared in the process of film coating, uniform coverage is not enough, after the film coating cracks on the surface. This kind of circumstance should be specific analysis. In addition to pay attention to the spray method in the construction, if necessary, should also change the formula and trial production.