Teach you 3 for exterior wall coating paint film cracking

Exterior wall coating especially popular in recent years, mainly because of exterior wall coating not only have adornment effect, but also protect the metope, make metope more durable. However, long-term exposure to the sun, rain, or other factors, the exterior wall coating paint film may be craze. So, exterior wall coating paint film cracking reason and the processing method is what? Exterior wall coating putty layer cracking causes of cracking. Due to the external wall putty quality defects, crack resistance is poor. Or due to improper operation, be bored with child after scraping metope due to drying shrinkage, cracking, which influence the coating surface. Grassroots craze. Exterior wall coating decorative surface for cement mortar plastering layer at the grassroots level in the condensation process can produce dry shrinkage and temperature shrinkage. Outer wall plastering construction of improper operation, easy to cause the empty drum and cracking. Before the coating surface, don't need to pay attention to repair, to enter the next process. After a period of sun exposure, internal cracks will gradually outward development. However, has a very thin film coating surface layer is difficult to resist stress, and accordingly the craze. Coating surface cracking. Due to the crack resistance is poor or improper construction, some quality problems of the coating after soon painted on the wall, prone to drying shrinkage cracking and other quality problems. Exterior wall putty prevention and solution of material choice. At present, there are many different kinds of building materials wall putty products on the market and has excellent crack resistance. Therefore, must choose carefully, as far as possible choose brand or large special cracking flexible putty products factory production. After launch, can choose a few products that meet the standards, and produce putty samples at the local level. After more than a few months of observation, when a project is about to enter in construction of exterior wall decoration, what kind of products the crack resistance of general can be compared. Cement used for rendering. Had better not use early strength cement setting time too fast, to avoid the cement mortar condenses too fast and caused by drying shrinkage cracking phenomenon. Don't be too fine sand should be qualified river sand, particle size, medium sand as well. The choice of exterior wall coating. First, select a few different brands of qualified products, sample as soon as possible, by observing the comparison to make a choice.