10 major precautions for paint and coating construction
1. Peeling of paint and coating: It may be because the surface is too smooth. If the original paint is lacquered or powdery (plus untreated paint coating), the new paint will not stick to the surface. Or it may be wood decay or metal rust spots, but also peeling off due to poor paint quality. A small area of ​​paint peeling off, can be sanded with fine gauze, then put on putty, brush the primer, and then repaint. Large areas of peeling must be stripped of the paint and repainted. 2, paint coating foaming: First, the bubble is broken, if there is water, it means that there is moisture infiltration under the paint layer or behind the sun, after the sun shines, the water evaporates into steam, it will make the patent leather foam. At this point, first remove the running paint with a hot air spray gun, let the wood dry naturally, then apply the primer, and finally repaint the entire repair surface. If there is no water in the bubble, it may be cracked in the wood grain, and there is a small amount of air inside. After the sun shines, the air expands and the patent leather bulges. In the face of this situation, first scrape off the foamed patent leather, then fill the crack with a resin filler, repaint, or do not use filler, directly apply microporous paint after scraping off the patent leather. 3, cracks: This situation is mostly removed with a chemical paint remover or hot air spray gun, and then repainted. If the fracture range is not large, the sanding block or wet and dry sandpaper can be used to wet the water, and the broken paint is ground. After the surface is smoothed, putty is applied, the primer is applied, and the paint is repainted. 4, paint and paint rogue: paint once brushed too thick, it will cause runny. The paint can be dried and brushed with a brush. If the paint has begun to dry, wait until it is dry. Smooth the surface with a fine gauze paper, brush the surface clean, then wipe it with a damp cloth, then re-coat the outer layer. Be careful not to brush too thick. 5, moldy discoloration: This problem occurs mostly on the surface of wet paint, such as water vapor condensation on glass and metal surfaces often produce brown-black stains. At this point, the fungicide can be used to treat the moldy parts according to the instructions of the instructions. After the mold is killed, the surface is cleaned and then repainted. 6. Stains: There are many reasons for stains on the surface of paints. For example, the water in the latex paint dissolves the material on the wall and rusts the paint surface, and the wall surface rubbed with steel wool produces rust spots. The dark pipe in the wall leaks stains and the like. To prevent stains, first apply a primer containing aluminum powder. If stains have appeared, remove the latex paint from the stains, brush the primer containing aluminum powder, and then repaint. 7. Loss of luster: The reason is that the primer is not applied, or the primer and the inner layer paint are not dried, and the varnish is directly applied. As a result, the varnish is absorbed by the wood and loses its luster. The bad paint is also a reason. Use old wet and dry sandpaper to rub off the old paint, brush off the dust, wipe the surface with a clean damp cloth, and then dry it again. It is important to note that painting in a very low temperature environment may also result in loss of gloss after the film has dried. 8. Wrinkle of paint film: It is usually caused by brushing the paint a second time because the paint is not dry for the first time. At this time, the solvent in the undercoat affects the upper paint film and wrinkles it. In this case, the creped paint film can be removed by chemical mercury removal or heating to repaint. Remember, you must wait until the first time the paint is dry before you can go to the second time. 9, the paint surface is rough: the newly painted surface is rough, usually the paint brush used is not clean or contaminated by the surrounding environment. It is also possible that the paint is mixed with patent leather, which has not been precipitated or filtered before use, or has been dusty when the paint is not dry. To prevent this from happening, a clean paint brush and paint bucket must be used. Always use old filter paper or filter with clean nylon stockings before use. In addition, the painted surface should be covered with a cover or cardboard when the paint is not dry to prevent dust. If the paint surface is rough, after it has dried out, smooth it with a dry and wet sandpaper, wipe it off, and then repaint the paint. Pay special attention to the paint brush must be clean. 10, paint and paint does not dry: indoor ventilation is not good or the temperature is too low, the paint will dry slowly. At this time, all doors and windows can be opened to promote ventilation, or a heater can be placed indoors to increase the room temperature. If the problem still cannot be solved, the painted surface may be greasy. At this point, the chemical paint remover or heat can be used to remove the paint, and the surface is completely wiped and repainted. Stainless Steel Ball,Welded Pipe Ball,Stainless Steel Pipe Ball,Stainless Steel Tube Ball Antong Valve Co.,Ltd , https://www.atvalveball.com