comprehensively check whether the cement wall to be painted in the blank room is solid and flat. If the plastering layer on the wall is not strong enough or there are big cracks and holes, it is recommended to complain to the developer or property and ask it to do it again. If individual holes are repaired by themselves, gypsum can be used to fill them.

Special note:

1

Checking whether the wall surface is solid and flat is a step to check the house. To see if the wall is solid, the simple inspection method is as follows: find a hard object (such as a key, screwdriver, etc.) and draw a line on the wall to see if there is slag falling. There is no shortcut to find cracks and holes, only care+patience.

2 generally speaking, it is not recommended to scrape putty and brush paint in the kitchen and bathroom, and it is best to stick tiles. Tiling is also a science, which will be discussed later.

step 2 finished product protection.

there will be dust when dealing with the wall surface, and it is inevitable that putty, paint or other glue will drip, so we must do a good job of protecting the finished decoration products in the room in advance

Special note: the protection work is listed as a separate step to increase everyone's attention to it. Never leave any regrets because of carelessness, especially when there are some dirty-resistant decorations at home!

Step 3 Preparation before putty scraping.

make sure that the wall surface is solid and smooth, and clean the wall surface with steel brush or other tools, so that the cement wall surface is as free from floating soil and floating and sinking as possible. Roll the concrete interface agent on the wall surface as evenly as possible, and after it is dried (usually more than 2 hours), you can blow putty.

Special note:

1 The purpose of the interface agent is to seal the base to prevent the putty from appearing problems due to the loose cement wall, floating soil or excessive dryness, and its surface is more suitable for putty adhesion than the cement wall.

2 if you don't plan to brush the interface agent, you must pay attention to the following words: in summer construction, the wall is dry, and clear water should be rolled before construction (leaving no clear water) to prevent the putty from pinhole or cracking due to too fast water absorption.

3 new cement walls (such as plastering by developers) cannot be plastered until the 28-day curing period of cement has passed, otherwise putty bubbles and insufficient strength will easily appear.

4

Sticking cloth (kraft paper): Its main function is crack resistance, and its cost is high, so it is not necessary to do it for general walls. However, for thermal insulation walls, loose walls and cracked walls, the effect of pasting is obvious and can be considered.

Step 4: Scrape putty (please choose water-resistant putty).

before blowing putty, measure the flatness of the wall surface (with a measuring ruler over 2m) to determine the method of blowing putty. Generally, two surfaces of the wall can be scraped with putty, 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, consider scraping gypsum for leveling first, and then scraping putty. Every time putty batch scraping interval should be more than 2 hours.

Special note:

1

Selection of water-resistant putty: 821 is a kind of putty whose use is restricted by order. It is water-resistant, unstable, prone to peeling and cracking. Many workers often add white latex, 18 glue and other glues to it in order to increase the firmness of 821, leaving hidden dangers for health. Water-resistant putty does not have the above risks. It is strong, water-resistant, can be used without any glue when mixed with water, and does not need to be eradicated after long-term use (1-2 years). It is a product that can truly achieve "long-term benefits from one construction". For a detailed comparison, please refer to my signature link to other knowledge posts.

2

The waterproof putty should not be scraped too thick in this construction, otherwise it will crack during drying, which is the fly in the ointment. Therefore, when the flatness is poor, it needs to be constructed many times, and even the thick bottom is hit with gypsum first. Gypsum is not water-resistant, not strong, and the setting time is extremely fast, so it is obviously not appropriate to scrape gypsum all over the house.

3 when mixing water-resistant putty, it should be prepared according to the ratio of powder: water = about 2: 1. First, stir it with an electric drill, leave it for about 1 minutes after it is basically uniform, and then fully stir it with an electric drill, and then it can be used.

step 5: polish the putty.

Water-resistant putty will become extremely solid after it is fully strengthened (5-7 days), and it will be extremely difficult to polish it at this time. Therefore, it is recommended to start polishing putty 1-2 days after scraping putty. Polishing can be done at night, with a light bulb of more than 2 watts close to the wall for lighting, and check the flatness while polishing.

Special note:

When polishing putty, a lot of dust will be produced. Please prepare masks for people present. Although putty is nontoxic and harmless, dust is not a good thing, so pay attention to prevention.

step 6: brush the primer.

after cleaning the floating dust on the polished putty surface, the primer can be applied. Primer can be painted once, and it must be uniform. After it is dry (2-4 hours), the next step can be carried out.

special note:

1

about primer: the function of primer is similar to that of concrete interface agent, but besides providing good adhesion, primer can also save some topcoats. Nowadays, the pace of life is fast, and many families often can't 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 (this is another flaw of water-resistant putty), otherwise the paint is prone to problems, especially the colored paint, and there will be uneven color like a map.

2 whether the primer needs to be mixed with water can refer to the description of the purchased primer, which varies.

Step 7: Paint the top coat.

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

special note:

1

brushing methods: roller coating and spraying have their own advantages and disadvantages. The surface of roller coating film is natural and textured, and it consumes little paint. The surface of spray coating film is fine and smooth, but it consumes more paint. The specific choice can be determined according to personal preference and economic ability.

2

amount of water added: most latex paints are sticky when the cover is opened, so it is usually necessary to add some water for better construction. The specific amount of water is different for each paint, but it is less than 3% at most. It should be noted that colored paints must be carefully mixed with water, otherwise it is easy to have uneven colors.

step 8 acceptance.

the surviving wall surface should be solid, flat, vertical with yin and yang, without cracks and holes, with uniform color and full paint film, and attention should be paid to the protection of finished products.