Ensure that the wall surface is solid and flat, and clean the wall surface with steel brush or other tools, so that the cement wall surface has no floating soil and floating subsidence as far as possible. Roll the concrete interface agent evenly on the wall as far as possible, and after it is dried (generally more than 2 hours), you can blow putty. Special instructions:

1 application of interface agent: seal the base to prevent putty from appearing problems due to loose, floating soil or over-dry cement wall, and its surface is more suitable for putty adhesion than cement wall.

If you don't plan to brush the interface agent, you must pay attention to the following words: construction in summer, the wall is dry, and clean water should be rolled before construction to prevent the putty from appearing pinholes or cracks due to excessive water absorption.

3 New cement walls (such as plastering by developers) can only be plastered after the 28-day curing period of cement, otherwise putty bubbles will easily appear and the strength will be insufficient.

4 Sticking cloth (kraft paper): The main function is crack resistance, and the cost is high, so it is not necessary to do it on the general wall. But for thermal insulation wall, loose wall and cracked wall, the pasting effect is obvious and can be considered.

Two: blow putty

Scrape putty (please choose waterproof putty). The smoothness of the wall surface should be measured three times before putty blowing (with a measuring ruler of more than 2m) to determine the method of putty blowing. Generally, putty can be scraped on both sides of the wall, which can both level and cover the background color. Putty with poor flatness needs to be scraped several times locally. If the flatness is extremely poor and the wall is seriously inclined, you can consider scraping gypsum for leveling first, and then scraping putty. The interval between each batch of putty scraping should be more than 2 hours.

Special instructions:

Select water-resistant putty for 1: 82 1 is a putty whose use is restricted by the order. It is waterproof, unstable and easy to peel and crack. Many workers often add white latex, 108 glue and other glues to increase the firmness of 82 1, leaving hidden dangers to health. Water resistant putty does not have the above risks. Strong, waterproof, can be used without any glue after adding water, and does not need to be eradicated after long-term use (10-20 years). It is a product that can truly benefit from one construction for a long time. For detailed comparison, please refer to my signature and link to other knowledge posts.

Water-resistant putty should not be scraped too thick in this construction, otherwise it will crack when it is dry, which is a fly in the ointment. So when the flatness is poor, it needs to be constructed many times, and even the thick bottom is plastered first. Gypsum is not resistant to water, not strong, and its setting time is very fast. Obviously, it is not suitable to blow gypsum all over the house.

3 when preparing water-resistant putty, it should be prepared according to the ratio of powder: water = 2: 1. Stir with an electric drill first, and then let it stand for about 10 minutes. Then fully stir with an electric drill, and it can be used at this time.

Three: polish putty.

After the water-resistant putty is fully strengthened (5-7 days), it will become extremely strong, and it will become extremely difficult to polish it at this time. Therefore, it is suggested that putty grinding should start 1-2 days after putty scraping. Polishing can be carried out at night. Bulbs with more than 200 watts are close to the wall, and the flatness is checked while polishing.

Special instructions:

There will be a lot of dust when polishing putty. Please prepare masks for the people present. Although putty is non-toxic and harmless, dust is not a good thing, so attention should be paid to prevention.

Four: brush primer

Brush the primer. After the floating dust on the polished putty surface is cleaned, it can be primed. Primer can be brushed once, and it must be uniform. After drying (2-4 hours), the next step can be carried out.

Special instructions:

1 Primer: Primer is similar to concrete interface agent, but it can save some topcoat besides providing good adhesion. Nowadays, the pace of life is fast, and many families often wait until the putty is completely dry and the alkalinity disappears (5-7 days) before painting. At this time, it is even more necessary to brush a layer of alkali-resistant primer to seal the alkalinity of water-resistant putty (which is another defect of water-resistant putty), otherwise the paint is prone to problems, especially the color paint, which will have uneven color like the picture.

Whether the primer needs to be mixed with water can refer to the instructions of the purchased primer, and so on.

Five: painting the top coat

Paint the finish. Generally, the top coat is brushed twice, and the interval between each time should be more than 2-4 hours (depending on the surface drying time) until it is basically dry. It takes 1-2 days for the paint to completely dry after the second coating. Before the paint is completely dry, it should be waterproof, drought-proof and sun-proof to prevent problems with the paint film.

Special instructions:

1 Brush coating method: roller coating and spray coating have their own advantages and disadvantages. The surface of roller coating film has a natural texture and consumes less paint. The surface of sprayed paint film is fine and smooth, but it consumes more paint. The specific choice can be determined according to personal preference and economic ability.

2. Water addition: Most latex paints are sticky after opening, so it is usually necessary to add some water for better construction. The specific water content of each paint is different, but it does not exceed 30% at most. It should be noted that the color paint must be carefully mixed with water, otherwise it is easy to have uneven color.