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Seven Common Problems in Car Painting

Seven Common Problems in Car Painting

Car painting is an important step in car beauty. Many car owners are not familiar with this aspect. The following are some common problems and precautions for car painting.


1. The shrinkage of HVLP car painting


In the process of painting or drying of the paint film, wrinkles or shrinkage will appear on the surface of the paint. This defect is most common in alkyd paint repair operations. In order to prevent this phenomenon, it is necessary to remove the shrinkage paint surface after the paint is fully dried, and paint the car again.


2. The bulge of HVLP car painting


During the painting process or the drying process of the paint film, the bumps formed in some areas due to the expansion of the painted surface of the HVLP for car painting may take on different shapes. The defective area can be polished to smooth but not worn through, and the HVLP car paint sprayer can be used to paint again.


3. The sagging of HVLP car painting


The coating part becomes thicker, and the vertical flow state appears due to gravity, which only appears when the vehicle sprayed surface is placed vertically or the surface sprayed vertically.


When there is a little sagging, after the paint is dry, sand the defective area with fine sandpaper first, and then wax and polish it. When the sagging phenomenon is serious, polish the defective area and spray paint with the HVLP automotive paint sprayer.


4. The water mark of HVLP car painting


White or yellow corrosive mottles appear on the surface of the paint layer. This situation often occurs on surfaces that are perpendicular to the sun, such as the roof, engine compartment cover, or luggage compartment cover.


If you suspect that the paint surface has thick wax, you should thoroughly clean the paint surface with a solvent before polishing. If repeated polishing does not work, you should use fine sandpaper to wet sand the water-marked area and re-spray.


Besides the HVLP automotive paint sprayer, you are supposed to equip the professional paint sprayer cleaning kit.


5. The HVLP car painting goes silk


Car paint running silk is caused by uneven reflection of silver powder. The silver powder particles are arranged in the same direction, showing stripes of light and dark. If there is wire running on the vertical surface, in most cases, the accumulated silver powder will pierce the paint film.


Polish the paint surface with fine sandpaper and spray it again, or increase the compressed air pressure after the car paint surface is completely dry. Increase the interval between the spray gun and the spray surface to 40-50cm, and then spray a layer of silver paint using a fast-drying thinner.


6. The HVLP car painting cracks


If the paint surface loses its luster severely, many tiny cracks will appear on the top paint layer. These cracks resemble the cracks of soil in a dry pond, often presenting triangular, star-shaped or irregular radial shapes. Cracking generally occurs in the topcoat of the automobile spray paint, and sometimes deepens to the inner coating.


If the cracks cannot be removed by grinding and polishing, the cracked parts should be thoroughly polished and smooth. When the situation is serious, the paint layer should be removed until the metal layer is exposed and then sprayed again.


If there are significant linear cracks penetrating on the surface of the topcoat, the cracks are relatively parallel. This occurs most often on black or other dark painted surfaces.


7. The bottom of the HVLP car painting is corroded


There are fine rust spots, spots, bubbles or peeling on the surface of the paint film. When the surface paint is peeled off, the area of the rusty part under the paint layer is larger than what is seen on the outside. This phenomenon is also called "rust spread".

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