Putty powder is a thick paste-like building decoration auxiliary material. It can fill and repair the base surface, lay the foundation for the subsequent coating construction, and play a decisive role in the final presentation effect of wall decoration! Therefore, putty powder construction must be taken seriously. Today, I will share with you several common problems and solutions about putty powder construction.
1. Putty powder peeling
Causes:
1. The polishing time of the interior wall putty powder is not well controlled. The surface will peel off after polishing after it has dried.
2. The putty powder is scraped thinly. Under high temperature conditions in summer, the water evaporates too quickly, causing the adhesive system to be damaged, so it is easy to peel off.
3. The product exceeds the shelf life and the bonding strength is greatly reduced.
4. The product is improperly stored, and the bonding strength is greatly reduced after moisture absorption.
5. The base layer has a high water absorption rate, which causes the putty to dry quickly and there is not enough water for curing.
Solution:
1. When polishing the surface of the interior wall putty, you must grasp the appropriate polishing time. The best polishing time is to polish immediately after the watermark on the putty surface is gone. Practice has shown that the surface should be flattened or polished after 1~2m2.
2. After the surface of the exterior wall putty is dry, it should be properly polished and fully watered for maintenance. Generally, the maintenance is divided into two or more times. If necessary, please use transparent sealing primer with water (1:5) as the second watering liquid, the effect will be better.
3. The product must be used within the shelf life. If it exceeds the shelf life, it must be scraped and tested. After passing the inspection, construction can be carried out.
4. The product must pay attention to waterproof treatment, should be stored in a cool and dry place, and ensure that the package is intact.
5. In summer or in high temperature and strong wind climate, wet the wall with water before applying putty, and then scrape the putty when there is no clear water on the wall surface.
2. Cracking, cracking, and dark marks
Causes:
1. Buildings may crack due to external factors such as thermal expansion and contraction, earthquakes, and foundation sinking.
2. When the proportion of mixed mortar is incorrect during curtain wall construction, the viscosity is high and the wall shrinks after the wall is completely dry, resulting in cracking and cracking.
3. Cracking of putty powder will basically form small micro cracks on the wall, such as chicken melon marks and tortoise shell marks.
Solution:
1. Since external forces are uncontrollable, it is difficult to prevent.
2. Putty powder should be scraped after the mixed mortar wall is completely dry.
3. If the putty powder cracks, the company's technical personnel should go to the site to confirm the actual situation of the wall.
3. Putty bubbling
Causes:
1. The base is too rough and the scraping speed is too fast.
2. The putty layer is too thick at one time, greater than 2.0mm.
3. The moisture content of the base layer is too high and the density is too large or too small. Because it is rich in gaps and the putty has more moisture, it is not breathable, and the air is enclosed in the gap cavity, which is not easy to remove.
4. The bursting and bubbling that appear on the surface after a period of construction is mainly caused by uneven stirring. The slurry contains powdery particles that have not been dissolved in time. After construction, it absorbs a large amount of water and swells to form bursts.
Treatment method:
1. For putty surfaces with large areas of bubbling, use a spatula to directly break the small bubbles, and re-apply the appropriate putty to the bubbling surface layer.
2. Putty is generally stirred evenly, let it stand for about 10 minutes, and then stir it again with an electric mixer before applying it to the wall.
3. When bubbling occurs during the construction of the second or later surface layer, use a scraper to press and break the bubbles to ensure that there are no bubbles on the putty surface before the watermark is removed.
4. For particularly rough walls, generally choose coarse putty as the base material as possible.
5. In an environment where the wall is too dry or the wind is strong and the light is strong, first moisten the wall with clean water as much as possible, and then apply the putty layer after there is no visible water on the wall.
4. Difficult to polish
Causes:
1. During the construction process, if the pressure is too high or the wall is difficult to polish, the density of the putty powder layer will increase, which will also increase the hardness of the relatively solid surface of the wall.
2. Walls that have not been polished for a long time after the last scraping or have been exposed to water, such as (humid weather, rainy season, wall seepage, etc.) are more difficult to polish. Some water-resistant putty powders are slow-drying products. The product features are: the hardness can only reach the best after one month. If it encounters water, it will accelerate its hardening effect. The above two situations increase the hardness of the wall, so it is more difficult to polish, and the polished wall is rougher.
3. The formulas of putty powders are different, and they are mixed together, or the proportion of the formulas is mismatched, which makes the hardness of the product higher after scraping (such as: mixing putty powders for interior and exterior walls, etc.).
Treatment method:
If the wall is too compact or polished, it needs to be polished. First, use 150# sandpaper to roughly grind it, then use 400# sandpaper to repair the grain or scrape it one or two times before polishing.
5. Color difference
Causes:
1. Putty powder itself is a semi-finished product. The instability of raw materials is an important factor causing color difference, because the quality of mineral powder mined in the mining area varies from region to region. If you don't pay attention to the configuration, each batch will have differences, causing color difference.
2. Because the supplier uses the method of "filling the number" to mix low-grade raw materials and deliver them, because the purchase quantity is large, it is impossible to sample one by one, resulting in individual "slippery fish" mixed in the production, causing individual color difference.
3. The color difference caused by the production staff mistakenly mixing raw materials of different grades together, or scraping products of different brands on the same wall.
Treatment method:
1. Color difference is generally not a formula problem, so there is no quality problem. For example, the wall to be painted can generally be covered with a paint film, which will not affect the overall decorative effect. If the wall that is not painted has color difference after two or three coats, it is recommended to apply another coat of putty powder or paint without color difference.
2. All personnel involved in production and construction should strictly follow the relevant standards for production and construction to avoid man-made quality problems.
If you want to completely avoid these problems, in addition to strictly implementing the construction standards, you should also pay attention to the selection of reliable quality putty powder products. Because high-quality putty powder not only has the characteristics of moisture resistance and crack resistance, easy scraping, good two-way affinity, fine whiteness and delicateness, but also pays attention to environmental protection! It can greatly improve construction efficiency and quality.