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First, the paint is peeled off: It may be due to the fact that the surface is too smooth. If the original paint is glossy paint or is powdery (with untreated paste paint), the new paint will not stick to the surface. Or it may be wood decay or metal rust, or peeling off due to poor paint quality. A small area of ​​paint is peeling off, which can be ground with a piece of fine paper, then putty put on it, brushed with a primer and repainted. Large areas of peeling must be stripped of paint and repainted.
Second, the paint blisters: First, the bubble pierce, if any water appears, that means the paint layer under or behind the infiltration of moisture through the sun a sun, water evaporated into steam, it will paint up into a bubble. At this point, the starting paint was removed with a hot air gun, the wood was allowed to dry naturally, then the primer was applied, and finally the entire repair surface was repainted. If there is no water in the bubble, it may be cracked wood grain, there is a small amount of air, the sun through the sun, the air expands, the paint bulge. Faced with this situation, first scrape off the blistering paint, then use a resin filler to fill in the cracks, repaint it, or use no filler. Apply a microporous paint directly after scraping the paint.
Third, cracks appear: In most cases, the paint must be removed with a chemical paint remover or hot air gun, and then repainted. If the fracture range is not large, then sanding blocks or wet or dry sandpaper can be used to dilute the broken paint. After the surface has been smoothed, apply putty, apply a primer, and repaint.
Fourth, the paint flow: paint a brush too thick, that will cause rogue. The paint can not yet dry, brush the paint to open. If the paint has started to dry out, wait for it to dry. Smooth the surface of the paint with a piece of shredded paper, wipe the surface clean, wipe it off with a damp cloth, and then re-apply the paint on the outside. Be careful not to brush too thick.
Fifth, moldy discoloration: This problem occurs in the wet paint surface, such as water vapor condensation on the glass and metal surfaces often produce brown-black stains. At this point can be used fungicides, according to the instructions of the instructions to deal with moldy parts, to be killed after the mold, the surface clean and then re-paint.
Sixth, stains: There are many causes of stains on the paint surface. For example, the water in the latex paint dissolves the material on the wall and the paint is rusted. The wall surface that is rubbed with the steel wool can cause rust. Dark pipe leaks in the wall appear stains. To prevent blemishes, a layer of primer containing aluminum powder may be applied first. If stains are already present, remove the emulsion paint from the blemishes, brush the primer containing aluminum powder, and then re-paint.
7. Lost luster: The reason is that the primer is not applied, or the primer and the inner layer of the paint are not dry, and the light paint is directly applied. As a result, the light paint is absorbed by the wood and loses luster. The bad paint is one reason. Grind the old paint with wet or dry sandpaper, brush the dust, wipe the surface with a clean, damp cloth, and dry the paint again. Special attention should be paid to the fact that if the paint is applied under very low temperatures, the paint film may lose its luster after drying.
Eight, film wrinkling: usually caused by the first pass of the paint is not dry brush the second time the paint caused. At this time, the solvent in the lower layer paint will affect the upper layer of the film to make it wrinkle. In this case, the wrinkled paint film can be removed by chemical amalgamation or heating and repainted. Remember, we must wait for the first time before we can paint on the second pass.
Nine, rough paint surface: the surface of the newly painted rough, usually the paint brush used is not clean or polluted by the surrounding environment. It is also possible that the paint is mixed with patent leather. It is not precipitated or filtered before use, or it is dusted when the paint is dry. In order to prevent these problems from occurring, clean paint brushes and paint buckets must be used. Old paint must be filtered with paint filter paper or clean nylon stockings before use. In addition, the painted surface should be covered with a cover or cardboard when the paint is dry to prevent dusting. If the paint is rough, after it has dried, use a wet or dry sandpaper to polish it and clean it, then repaint it. Pay special attention to the paint brush must be clean.
Ten, 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 put a heater in the room to increase the room temperature. If this does not solve the problem, the painted surface may be greasy. At this point, remove the paint with a chemical paint remover or heat, wipe the surface thoroughly and repaint it.
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