When tearing down the wall, you should first paint a layer of glue on the wall, such as 107 glue (or use 108 environmental protection glue) to seal it first. Then paint the walls with putty powder. Latex paint must wait for the wall to dry before brushing, otherwise even the latex paint will turn yellow.
After the wall treatment is completed, brush latex paint. Generally, it is a bottom with two sides. It is the first time to paint the wall with a special primer for the wall. I suggest you buy an alkali-resistant primer as a primer. Then the top coat depends on what brand you like. Nippon Dulux can, and it's also good to buy waterproof topcoat.
Is it part or all:
If it's local, it's not as good as cold mountain, around the window, because there is no alkali-resistant primer. If it just turns yellow, it won't come off. Then directly apply alkali-resistant primer 1-2 times on the surface, and then apply latex paint twice. If there is powder falling, the yellow part should be thoroughly removed and painted on the cement base with alkali-resistant primer or sealing primer. It is required to dry one side horizontally and then repeat it vertically. After drying, scrape the waterproof putty on the inner wall and polish it twice, then brush one bottom and two sides.
If it is yellow in a large area, it depends on whether this wall in your house is newly built after renovation. If it is a new wall, it generally needs to be cured for 28 days under ventilated conditions, and the PH value of the wall should be between 8- 10 before scraping. If the urgent construction fails to reach this time, the painted wall will turn yellow. Treatment: Shovel off the putty layer (be sure to clean it up), and then carry out acid etching treatment.
The specific method is to use 10% or more aqueous solution of zinc sulfate (available in chemical stores) to brush the wall, and brush it repeatedly to make the zinc sulfate solution penetrate into the wall, at least three times. After 24 hours, clean the wall with clean water (brush the wall), and then test it with PH test paper. If the PH value is less than 10, follow-up work such as putty scraping can be carried out. If the test results do not meet the appeal requirements, it is necessary to continue the acid etching treatment. The method is as above. Until the conditions are met.