Exterior wall putty powder is used as a base for exterior wall coating, and leveling materials are a very critical step. Especially when choosing exterior wall putty powder, you also need to pay attention to many issues. Many construction parties will choose some relatively cheap putty when choosing exterior wall putty for exterior walls. If you say that it is okay to apply common paints. However, once the surface layer is applied to the exterior wall paint of the imitation stone paint, then various problems will arise. Today we are going to share what causes the alkali reflux of exterior wall putty powder?
1.Rain-bearing construction.
All exterior wall products are strictly required and are not allowed to be constructed in the rain. However, in many construction sites, construction may be carried out when it rains in order to meet the deadline. The consequences of this situation are very serious. The first is that the strength of the exterior wall putty will decrease. At the same time, it will cause the wall to appear anti-alkali.
2.The humidity of the base wall is too high or the curing period has not yet arrived. Normally, the poured wall needs to be plastered. Mortar generally needs to have a curing period. At least 48-72 hours later, the layer of mortar is completely dry before the application of putty can be carried out. In addition, the humidity of the base layer of putty construction is too large just after the rain, which may cause the putty powder of the exterior wall to be alkaline.
Once the external wall surface is anti-alkali, it is relatively troublesome to deal with. First of all, we need to dispose of the part that has returned to alkali. Here we recommend using an acidic liquid to treat the anti-alkali area. Then draw a brush with an anti-alkali sealing primer. If there is a large area of the room, then it is necessary to remove all the exterior wall putty and then re-scrape, and then carry out the construction of the exterior wall coating.
There are also many problems that need to be paid attention to when choosing materials for exterior wall construction, not because of the low price, but also according to the actual requirements of walls, walls and exterior wall coatings.