Yellow plasterboard
The yellowing of gypsum board partition walls and suspended ceilings is mostly due to construction process problems. The first is that the environment is humid due to excessive construction and poor ventilation. The second is that the putty is not approved according to the requirements of the construction process. When the first batch of putty is not dried, the second or third batch of putty is approved. This will quickly penetrate the color outward; the primer and topcoat are too short and the paint is not dry. This will happen after finishing, because the paint used is water-based paint, two or three coats of paint are applied before it is completely dry, and the color will penetrate outward with water, and yellowing will occur after the alkali returns. Third, there is no closed primer. If the substrate is too alkaline, it will easily cause the paint film to turn yellow. Cheap latex paints will also yellow more quickly when they are applied simultaneously with polyurethane oil paints.
