How to repair the cracks in the board and wall by yourself?

Wall cracks can be repainted by yourself, and the process is simple:

1, water on the wall: It turns out that the wall is covered with water, which saves labor when shoveling.

2. Shovel the wall skin: remove the flooded part of the original wall until the cement mortar wall or putty layer is exposed.

3. Interfacial agent: the wall surface shall be coated with interfacial agent, and all interfacial agents shall be coated evenly.

4. Cracking: In general, cracks are adhered with kraft paper tape and white latex (but there is no guarantee that 100% will not crack again).

5. Leveling: Uneven walls need leveling. Gypsum is generally used, and the uneven difference is not more than 0.5 cm.

6. Sticking: Non-load-bearing walls such as light walls and thermal insulation walls need sticking. Try to choose better wall cloth and white latex. If possible, you can use grid cloth, and the anti-cracking effect will be better.

7. Batch scraping putty: It is better to choose putty with high particle fineness and hard texture, or you can add some white latex to the putty to improve the hardness of the putty.

8. Polishing: Try to use fine sandpaper, generally use 400-500 grit sandpaper for soft putty (such as 82 1) and 360-400 grit sandpaper for hard putty (such as wall lining and easy leveling). If the sandpaper is too thick, it will leave a deep sand mark, which cannot be covered with paint. The polished wall must be thoroughly cleaned to avoid too much dust and affect the adhesion of paint. The concave-convex difference shall not exceed 3mm.

9. Primer: Primer must be brushed evenly to ensure that every part of the wall is brushed. If the wall eats a lot of paint, it is best to add a little more water to the primer to ensure uniform brushing. Don't think that a roller is enough just because it is a primer. The brushing effect of primer will directly affect the effect of topcoat. Use a roller with the same texture as the top coat.

10. Repair: There will be some defects (pits) after the putty is polished, which is generally difficult to see clearly. Draw it once to make it obvious. At this time, it needs to be patched. Pay attention to patching, be sure to polish it flat, and then brush the primer with a little more water to avoid color difference caused by different water consumption from other walls when brushing the topcoat.

1 1. Topcoat: Do not add too much water, which will affect the thickness, feel and hardness of the paint film. Try to choose better tools. The hair of the roller should not be too short, but it must be thin, so that the paint film drawn will have a delicate feeling. Brush painting mainly pays attention to the corners, the indirect stubble part in each roll and the direction of paint collection. In most cases, brush the corners with a combination brush or a brush. There will be visual differences. If possible, you can buy an edge roller, and then use the edge roller to collect the edges and corners. Note that the material of the edging roller should be the same as that of the roller used to brush the large surface. When painting a large surface, the paint must be collected evenly in every continuous place, neither too thick nor too thin, otherwise the reflection will be inconsistent due to uneven thickness. When painting, every time you roll on the wall, there will be a paint collection action, which needs to be rolled every time. (suggestion: buy a tray before painting, which will be sold in the store. Using the tray can ensure that the paint on the paint roller is the same every time, which will brush evenly. )

12, care: latex paint will dry after 4 hours, but the dried paint film has not reached a certain hardness, so it needs care. It's simple. Do not scrub or touch the wall for 7- 10 days.

Cracked boards can also be repaired by themselves, just follow the following steps:

(1) wood paint

1. varnish technology

(1) Apply colored oil or colored oil (Note: this process is not required for ordinary projects only for projects requiring color change).

(2) Apply varnish to protect primer (if there is no 1 procedure, this is the first procedure).

If the paint is a primary color paint, the surface must be cleaned immediately after purchasing materials at the construction site, and the first protective primer should be applied. Primer usually consists of topcoat.

Note: the varnish surface must be applied before painting the wall paint.

(3) Clean the dust and dirt on the wood surface.

(4) Use sandpaper to polish the board surface or wood line surface.

(5) Brush the paint for the first time.

(6) After drying, mix the prepared color powder, cooked rubber powder and Shuangfei powder into putty to cover nail holes and tree scars, making them the same as color matching.

(7) After drying, it is very important to polish the rough part of the toner with fine sandpaper.

(8) Brush the paint again.

(9) Dry and polish with fine sandpaper.

(10) Brush the paint once.

That is, after painting, add fine sandpaper to polish it, and so on. If there is a special primer, replace the first coat with a special primer.

(1 1) Wet the wood surface with a wet cloth, then wet it with sandpaper and polish the surface, commonly known as water mill.

(12) Brush the paint for the last time.

Generally speaking, counting the last layer, * * * needs to be painted for 4-8 times to get better results. The more coats of topcoat, the better, but generally it should not exceed 10 times. During construction in wet weather, the paint film will turn white, which can be eliminated by adding nitro magnetized white water with dilution of 10%- 15%.

2. Oil mixing process

(1) Clean up the dust and dirt on the wood surface first.

(2) Mix the surface of the whole batch of wood with pig blood ash and Shuangfei powder.

(3) Dry thoroughly and polish with sandpaper.

(4) Brush the paint for the first time.

(5) make up for the defects.

(6) Dry and polish with sandpaper.

(7) Brush the paint for the second time.

(8) Dry and polish with sandpaper.

(9) Paint for the third time.

Generally speaking, it is advisable to mix oil for 2-3 times.