These are two common phenomena in paint construction: one is paint sagging, and the other is rough surface of paint film. The phenomenon of paint dripping, sagging and uneven paint film on the surface of the base layer can be called paint sagging. The main reason for this phenomenon is that the prepared coatings are too thin and have poor adhesion, and some coatings flow under the action of gravity; Brush or spray paint is too thick, and the paint film is too heavy to fall off; The construction environment temperature is too low and the paint film dries slowly; Paint contains too many pigments; The thickness of paint film is uneven, and the parts with too thick paint film are prone to sag; There is oil, water and other dirt on the surface of the object base that is incompatible with the paint, which affects the adhesion and causes the paint film to sag. To prevent the paint from sagging, first of all, we should choose good quality paint and diluent with appropriate volatilization speed, and control their dosage. Secondly, the surface of the object should be smooth and smooth. Thirdly, the construction environment temperature should meet the standard requirements of coating types. For example, the varnish should be painted at 20 to 27 degrees Celsius and within 3 hours. When painting, first level vertically, horizontally and obliquely, and then level vertically to make the film thickness uniform. Finally, the moving speed of the spray gun and the distance from the object should be controlled evenly during spraying. As long as the above points are achieved, I believe that the phenomenon of paint sagging can be avoided. Anti-surface roughness is specifically manifested in: after the coating is formed into a film, the surface is uneven, with sand-like protrusions or small bubbles. Therefore, this phenomenon occurs because there are too many pigments or too coarse particles in the paint; The paint itself is not clean and mixed with impurities; When the paint is mixed, the ambient temperature is low, and the bubbles in the paint are not completely dispersed and discharged; When painting, the surface of the object is not cleaned and mixed with the paint film; Used brushes, paint buckets, spray guns, etc. Uncleanness will lead to rough surface of paint film. To prevent the surface of the paint film from being rough, we must first choose the paint with good quality, carefully screen it before use, blend it evenly and use it without bubbles. Next, we should pay attention to cleaning the surface of the object and keep it flat, smooth and dry. Then it is very important to arrange the construction sequence of each type of work reasonably to ensure that the painting construction environment is free of sundries and dust. Finally, we must be careful not to reuse containers that have been filled with paints of different models and properties. How to prevent the surface of paint base from dripping down? Q: The surface of the paint base layer drips like water drops, and there are bumps like sand grains on the surface in some places. What happened? How to prevent it? Answer: These are two common phenomena in paint construction: one is paint sagging, and the other is rough surface of paint film. The phenomenon of paint dripping, sagging and uneven paint film on the surface of the base layer can be called paint sagging. The main reason for this phenomenon is that the prepared coatings are too thin and have poor adhesion, and some coatings flow under the action of gravity; Brush or spray paint is too thick, and the paint film is too heavy to fall off; The construction environment temperature is too low and the paint film dries slowly; Paint contains too many pigments; The thickness of paint film is uneven, and the parts with too thick paint film are prone to sag; There is oil, water and other dirt on the surface of the object base that is incompatible with the paint, which affects the adhesion and causes the paint film to sag. To prevent the paint from sagging, first of all, we should choose good quality paint and diluent with appropriate volatilization speed, and control their dosage. Secondly, the surface of the object should be smooth and smooth. Thirdly, the construction environment temperature should meet the standard requirements of coating types. For example, the varnish should be painted at 20 to 27 degrees Celsius and within 3 hours. When painting, it should be leveled vertically, horizontally and obliquely first, and then vertically, so as to make the film thickness uniform. Finally, the moving speed of the spray gun and the distance from the object should be controlled evenly during spraying. As long as the above points are achieved, I believe that the phenomenon of paint sagging can be avoided. Anti-surface roughness is specifically manifested in: after the coating is formed into a film, the surface is uneven, with sand-like protrusions or small bubbles. Therefore, this phenomenon occurs because there are too many pigments or too coarse particles in the paint; The paint itself is not clean and mixed with impurities; When the paint is mixed, the ambient temperature is low, and the bubbles in the paint are not completely dispersed and discharged; When painting, the surface of the object is not cleaned and mixed with the paint film; Used brushes, paint buckets, spray guns, etc. Uncleanness will lead to rough surface of paint film. To prevent the surface of the paint film from being rough, we must first choose the paint with good quality, carefully screen it before use, blend it evenly and use it without bubbles. Next, we should pay attention to cleaning the surface of the object and keep it flat, smooth and dry. Then it is very important to arrange the construction sequence of each type of work reasonably to ensure that the painting construction environment is free of sundries and dust. Finally, we must be careful not to reuse containers that have been filled with paints of different models and properties.