White shift the reason: · There is a dirty handprint on the substrate or paint film after the sand is stained with water (water sand). · After the water sand, the substrate or paint film is dry, but there is moisture in the micropores of the substrate. prevention: · Ensure that the surface of the substrate or paint film is clean before painting with water sand. · After water sand, it should be fully dried to remove water. · Consider using a dry sand process. ·Treatment method: remove the problem paint film, dry and polish and recoat. 2, sand marks the reason: · Poor adhesion between layers due to improper ratio and poor flexibility of paint film. · The recoating interval is too long. prevention: · Lacquer in strict accordance with the specified ratio. · The recoating interval should not be too long (6-12 hours). · Paint off to the surface of the substrate and re-coat it in strict accordance with the regulations. 3, particles the reason: · The painting environment is dirty. • There are dust and other debris on the surface of the substrate. · There are impurities in the paint. • The painting tool is not clean. · Inferior paint or paint has deteriorated. prevention: • Make sure the surrounding environment and the surface of the coated substrate are clean before painting. · Paint is applied after filtration. • The painting tool needs to be clean. • Deteriorated paints are not available. · Use high quality paint. 4, foaming the reason: · Wood moisture content is high. · The air humidity is too high. · The bottom layer is not dry. • The coating is too thick and the solvent is difficult to volatilize. prevention: · Pay attention to the moisture content of wood and use it after drying. • If the humidity is too high, the construction can be suspended. · The primer layer must be fully dry, otherwise it should not be painted. • The primary coating does not exceed 30 μm. 5, crack the reason: · Wood has a high moisture content, causing shrinkage. · The film is too thick at one time. • The undercoat is not sufficiently dried, that is, topcoat. • Excessive addition of curing agent. · The properties of the upper and lower coatings are different. · Old film with cracks is re-coated. ·The bottom ash is less oily, easy to shrink, and insufficiently filled. prevention: · Wood moisture content should be dried to more than 10%. • Appropriate coating amount, a small amount multiple times, and the layers should be sufficiently dry. • Apply the top layer after drying. • Add a curing agent in proportion. · Correct understanding of the matching of the same type of paint, carefully choose. ·Remove the old paint film that has cracked before it can be sprayed. · Fill enough and leave no cracks. 6, peeling off the reason: · High oil content in wood. · Wood moisture content is high. • The surface of the substrate is contaminated with wax or oil. · The front paint film is contaminated. · The layers are not polished enough. prevention: · After the wood is degreased, brush it again; · Control the moisture content of wood below 10%; · Remove oil and wax, keep the paint film clean; · Strengthen the polishing between layers. 7, whitish the reason: · The relative humidity of the air exceeds 80%. · Dilution is not used properly. · Transparent putty is too thick. prevention: · Pay attention to the air humidity at the construction site. · Try to use the manufacturer's matching material. ·Plastic putty is thinly batched, and it should be polished as much as possible after drying. 8, sag the reason: · The viscosity of the coating is low. · The diluent volatilizes slowly. · The partial paint film is too thick. · The surface of the substrate is uneven. · There are too many paints on the edges and corners. · The product itself is a problem. prevention: • Properly increase the viscosity of the coating. · Improve the flatness of the substrate. • Use fast drying thinner. · Don't paint too thick because of the time. • Remove excess paint from the corners. 9, bite the bottom the reason: · The front coat is not sufficiently dry; · Improper supporting system; • The diluent is not used properly. prevention: ·The front coat is dried before it is finished; ·Use matching bottom paint and matching thinner. 10, shrinkage hole the reason: • High oil content in wood or oily or waxy surfaces. · The substrate is not filled tightly. • There is oil in the compressed air. · Inferior paint. prevention: · Oily wood should be degreased and sealed. • Solvent rubbing oil or wax contaminated substrate surface. · Change the paint and fill the holes tightly. · Regularly clean the pipeline during spraying and drain the oil. 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