Step 1: Clean the wall.
Before the renovation of the old wall, the wall must be primed. Thoroughly remove the severely powdered wall, and then apply a layer of white cement. If the old wall is smooth and has paint, it should be polished after being removed to remove the skin that is not firmly attached, so as to facilitate the bonding between the new paint and the wall.
Step 2: Brush the primer.
Second-hand housing decoration, wall treatment must brush primer. Wall primer can not only resist alkali and moisture, seal building materials, but also protect topcoat, and improve the texture and hiding power of topcoat. If the wall surface is directly painted with topcoat without primer, the wall surface will be prone to foaming and mildew after a long time, and even become discolored in the sun for a long time.
Step 3: repair in a large area.
When repairing the wall, it is best to repair the whole wall, or try to choose a larger area. This can try to avoid the color difference caused by wall repair, and the quality of the repaired wall is better.
If the wall has been painted, it will be more troublesome to maintain. It is not only easy to produce color difference, but also the use time of materials is different, so the quality can not be well guaranteed and the ideal effect can not be achieved.
Step 4: Prevent chromatic aberration.
When decorating the wall, we must pay attention to avoid color difference on the wall as much as possible. Pay attention to the scale and draw according to the instructions of the paint bucket. It is best to estimate the amount of paint and prepare enough at one time, so as to ensure the consistency of wall color and avoid the color difference caused by reallocation when decorating the wall.