Must I paint the walls with putty? How about white lime painting?

First, the walls must be plastered with putty. Putty is used to make the base surface smoother, which is beneficial to the subsequent coating construction. After the putty is completed, it should be painted with primer and then painted with topcoat. If the paint is directly coated on the wall with cement bottom, it will first affect the decorative effect, and then increase the dosage of paint and increase the construction difficulty.

Second, white lime can be used for painting, but it is easy to have powder after drying, but a certain proportion of special adhesive can be added. Because the lime slurry is blocky after drying, after a certain period of time, it will produce powdery things (CaCO3) under the action of carbon dioxide and water in the air, which is not sticky. White lime painting is no longer used for domestic purposes, but is usually used in industrial factories and unimportant walls.

Extended data:

Putty construction technology:

1, base treatment: For the cast-in-place concrete wall, due to the floor, materials, isolation agent and other reasons, the flatness of the wall is poor, and there are often phenomena such as porosity, honeycomb, pits, uneven angle of yin and yang, arching and so on. Therefore, it is required that the convex part should be polished flat and the concave part should be filled flat.

For precast concrete floor slab and slab joint base, the floating sand, pimples, dust and other impurities on the surface must be brushed by a special person with a wire brush. The grey surface of cement mortar paper reinforcement requires the surface base to be dry, solid and clean (no floating soil and oil pollution).

2. Repair at the grass-roots level: After the joints of concrete roof panels are cleaned, the gypsum putty shall be leveled and compacted with a steel scraper, and scraped horizontally and vertically (the top surface with smooth surface is not required to be scraped). The proportion (weight ratio) of gypsum putty is gypsum: emulsion: cellulose aqueous solution.

Brush caustic soda solution: use 5? "Sodium hydroxide solution besmear brushs twice, if use 10? "Brush it again. Rinse with clear water immediately after brushing your teeth, and then proceed to the next process after drying.

3. Coating adhesive (fruit juice pulp): spray a layer of adhesive evenly before putty scraping, and the proportion (weight ratio) of non-leakage adhesive is clear water: emulsion = 100: 15 ~ 20. Scraping putty: Scrape putty back and forth with a steel scraper. Pay attention to the top, bottom, left and right. The space between the two scrapers should be clean, and floating putty is not allowed. When scraping putty, you must prevent contamination or mixing with sand particles.

The proportion (weight ratio) of white putty is white powder: talcum powder: cellulose solution (concentration 5: emulsion = 60: 40: 75: 2 ~ 4).

4. Repair and polishing: After scraping the putty for the first time, the parts repaired for the first time should be re-inspected. If there are any problems, the collapsed part should be repaired and leveled with putty. After the putty is dried, it should be polished smooth and cleaned with sandpaper.

5. putty survival: scrape the white putty twice, and scrape it again after the first putty is dry. It is generally required to survive at least twice. It is required that the surface is not only flat, but also uniform in texture and texture, otherwise it is easy to have inconsistent color shades, which will affect the decorative effect.

References:

Baidu encyclopedia-scraping putty

Baidu encyclopedia-indoor lime coating material