In recent years, in the field of exterior wall decoration, the development of imitation stone coatings can be described as a day-to-day, due to its energy-saving and environmental protection, the effect of stone-like effect is realistic and the cost is relatively cheaper than stone, it has been widely used. However, in the specific construction, due to improper operation or product quality problems, various coating defects often occur.
First, spray off the sand
1. Loss occurs in any spray, and sand falling during spraying is a normal phenomenon, but it can be controlled within the appropriate range by construction.
2, improper grading of gravel, improper construction operation, improper paint consistency can easily cause sanding phenomenon.
Solution
1. According to the viscosity of the construction product, the construction air pressure, the construction personnel's method, etc., it is recommended to do the coating rate test before the project starts.
2. Grading the gravel according to a certain number of ratios, adjusting the caliber and pressure of the spray gun, and adjusting the consistency of the paint according to the specifications.
Second, spray hair
1. The uneven thickness during the construction process is prone to flowering. In addition, if the amount of imitation stone paint is too small and the paint film is too thin, it will cause flowering.
2, the influence of the pH of the base layer, the pH is greater than 9, it will lead to flowering.
Solution
1. Strictly implement the normal construction dosage, do not cut corners, and recommend thin spray multiple times during spraying.
2. Strictly control the pH of the base layer and use the alkali-resistant primer to make the back cover treatment to prevent the precipitation of alkaline substances.
Third, the color difference phenomenon
1. The use of poor quality tools in painting is prone to chromatic aberration. Poor coating tools can cause uneven coating and uneven thickness, resulting in chromatic aberration.
2, because the imitation stone coatings generally use natural colored sand, affected by the objective factors of natural raw materials, the imitation stone coating in the production process, easy to appear a slight color difference between different batches, after construction, will visually increase the surface of the wall Color difference.
3, the same batch of products painted wall surface will also cause color difference problems because there is no uniform mixing, inconsistent dilution, and different construction methods.
Solution
1. Use high quality coating tools to avoid uneven coating and uneven thickness. Different types of products are strictly in accordance with the exclusive construction tools of the product, and there is no common construction tool for different products.
2, the same building, try to get enough of the required products at one time; need to supply the batch at different times, negotiate with the manufacturer to prepare the colored sand raw materials, less color difference in the raw materials.
3. It is recommended that the same batch of materials be used in the same wall for the same batch of construction. The overall wall surface should be from top to bottom, in one go, to avoid the old and new colors caused by intermittent construction. The flat and matte effects produce sensory differences, paying attention to the color differences of certain colors in backlight and specular, direct sunlight and refraction. Repair the color difference: After the construction of a wall, try to leave a few barrels of the same batch of products in order to repair the wall of the concrete in the end of the project to avoid the color difference caused by the tail cleaning.
Fourth, whitish phenomenon
1. The concrete wall returns to the alkali phenomenon, and the finger will have a white powder.
2. There is no such phenomenon when there is no varnish finish, and whitening appears after the roll coating, just like the fog is on it.
Solution
1. Use alkali-resistant primer to prevent alkali return on the wall.
2, this is because the surface of the real stone paint is rough and uneven, the roll coating is not evenly coated, which will cause the top coat to accumulate in the groove. It is recommended to use spray coating for high gloss dust cover.
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