Rough wall-scrape putty 2-3 times-sanding-primer-find repair sanding (be sure to use primer to apply the paint again)-topcoat twice-maintenance
Cracks: Under normal circumstances, use kraft paper tape and white latex to stick to the cracks (but there is no guarantee that 100% will not crack again).
Leveling: uneven walls need to be leveled, gypsum is generally used, and the difference between unevenness is not more than 0.5 centimeters.
Patchwork: Generally, non-load-bearing walls such as light-weight walls and thermal insulation walls need to be patched. Try to choose wallcloths and white latex with a better texture. If you have the conditions, you can use mesh cloth, and the relative crack prevention effect will be better. a little.
Putty: It is better to use putty with higher particle fineness and harder texture. You can also add a certain amount of white latex to the putty to increase the hardness of the putty.
Sanding: try to use finer sandpaper. Generally, the softer putty (such as 821) uses 400-500 sandpaper, and the harder texture (such as wall lining, easy flat) 360-400 is better. If sandpaper If it is too thick, it will leave deep sand marks, and the paint will not cover it. After polishing, be sure to clean the wall thoroughly to avoid too much dust and affect the adhesion of the paint. The difference between unevenness is not more than 3 mm.
Primer: The primer must be brushed evenly to ensure that the wall is brushed everywhere. If the wall has a large amount of paint, it is best to add a little more water to the primer to ensure that it can be evenly applied. Don't think it's enough to use a poor roller because it's a primer. The brushing effect of the primer will directly affect the effect of the topcoat. Use a roller with the same texture as the topcoat.
Finding tonic: After finishing the putty, there will be some defects (holes), which is difficult to see under normal circumstances. It will be obvious only after the paint is applied once. At this time, it is necessary to find the tonic. Note that the tonic must be polished and smooth. Brush the primer with a little more water to avoid the color difference due to the different draught from the other walls when applying the topcoat.
Topcoat: Do not add too much water, it will affect the thickness, feel and hardness of the paint film. Try to choose a better tool. The hair of the roller should not be too short, but it must be fine, so the paint film will feel Delicate, brushing mainly pays attention to the corners, indirect stubble during each roll, and the direction of the paint collection. The corners are usually treated with a row of pens or board brushes. This will easily cause the corner texture to be inconsistent with the entire surface. The difference, if you have the conditions, you can buy a trimming roller. After the corners are painted with a board brush, then use the trimming roller to collect it again. Note that the material of the trimming roller should be the same as the roller that brushes the large surface. The paint at the rolling joint must be even, not too thick or too thin, otherwise it will cause inconsistent reflection due to the uneven thickness. When painting the paint, there will be a paint collection action after rolling on the wall, which requires each roll The direction of the paint collection should be consistent, otherwise the texture of each roll will be inconsistent, the angle of reflection will be different, and there will be differences in vision. (Suggestion: Buy a pallet before painting, it will be sold in the store. With the pallet, you can ensure that the paint on the roller is the same for each roll, so that it will be evenly painted.)
Maintenance: The emulsion paint will dry after 4 hours of application, but the dried paint film has not reached a certain hardness. This requires care. It is very simple. Do not scrub or touch the wall within 7-10 days. Just move.
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