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Second, the coating surface rough paint (a) phenomenon The surface of the paint film is not flat, there are sand-like bulges or small bubbles. (b) Cause 1. The quality of the coating is not high, or too much pigment is added in the formulation, and the particles are too large, even mixed with impurities. 2. Paint bucket, brush or spray gun is not clean. 3. When the paint was mixed, the temperature was low, and the paint air bubbles did not completely spread out. 4. The construction environment is dirty, dust, sand and sand stick to the brush, paint, paint film. 5. The surface of the object being painted has not been cleaned. (III) Measures 1. Choose a good quality paint, and mix the added pigments to crushed and sieved. 2. Paint buckets, brushes, or spray guns should be cleaned in time and checked before use. Residues should be cleaned first. 3. Clean the construction environment before the paint is applied, keep it free of dust and sand, and clean and brush the objects.
Third, the film wrinkles (a) phenomenon paint film surface stripes. (b) Cause 1. Poor paint quality, too much driers, too much solvent evaporation. 2. The paint is too thick and too thick or uneven. 3. The temperature of the environment is too high. (III) Measures 1. If qualified paint is selected, driers should not be added arbitrarily and the consistency of the paint should be strictly controlled. 2. Brushing should be uniform and consistent in thickness.
Fourth, after brushing varnish, the wood grain is not clear (a) The phenomenon of wood grain color shades is different, the wood grain is fuzzy. (b) Cause 1. The paint is stored for a long time and the pigment is precipitated, and there is no agitation even when the operation is shallow and deep. 2. The same type of wood was not used, resulting in different shades of coloration. 3. Brushing operation is not standardized. (III) Measures 1. Stir the paint thoroughly before use and make it uniform. 2. Different kinds of wood adopt different treatment methods and brushing methods to achieve the effect of uniform colors. 3. Brushing operation specification.
Fifth, paint mixed (a) phenomenon First, the paint is used for different base layers, and the second is any water or incompatible solvent in the paint. (B) The reason does not know the technical performance characteristics of the paint. (III) Measures 1. According to different base materials, select the appropriate coating, such as concrete, cement, mortar and other inorganic silicate base, must choose a better alkali resistance coating. The surface of steel components should be painted with a rust-proof primer, then painted with a matching oily, phosphated primer, lead oil, and blended paint. 2. Silicate paints are not allowed to be sprayed directly on the surface of the plaster putty. Otherwise, chemical reactions will occur and the paint will deteriorate. 3. Without knowing the technical performance of the coating, it is not allowed to add water to the coating or to mix several coatings. Such as latex paint is not allowed to use paint color; vinyl acetate latex paint is not allowed to mix with organic solvents; 801,106 and other interior wall paint is not allowed to add water and so on.
Common problems in paint construction and countermeasures
First, putty crack (a) phenomenon Putty cracks after drying, leading to hole cracking paint. (b) Cause 1. Putty large white powder, talc ratio is high, the proportion of rubber is too low, so putty sticky. 2. Once putty is too thick or uneven. 3. The grassroots processing is not clean, the dust and impurities in the pit are not cleaned, and the putty cannot take root. (III) Measures 1. When adjusting the putty, the consistency is moderate and the glue can be slightly more. 2. Grassroots clean. The pit can be coated with adhesive solution first, with a large hole and a layered putty. 3. Putty should be evenly handled, not too thick each time.