Defects in car paint spraying----watermark：
White or yellow corrosion-like spots appear on the surface of the paint layer, mostly on surfaces that are perpendicular to the sun, such as the roof, engine cover or luggage compartment cover.
(1) Cause:
①The paint layer has come into contact with water droplets, especially water with high mineral content, without adequate drying. When the water droplets mix with the solvent in the paint, they can penetrate the paint surface, leaving a water mark. Therefore, the paint surface after spraying is strictly prohibited from contact with water, and it is strictly prohibited to drive in rainy days.
② Even if it is a dry paint surface, if it is often exposed to water droplets, it will leave water marks on the paint surface. Under sunlight, the water droplets have the transmission focusing function of a magnifying glass, and after the water droplets dry, they will leave a white or yellow corrosion outline on the paint surface.
③ If the sprayed paint surface is too thick, the drying time will be prolonged, and the probability of leaving water marks after the paint surface contacts with water droplets is greater.
④ Silicon-containing polishing materials are used prematurely on the paint surface that has been sprayed soon.
(2) Correction method:
If you suspect that the paint surface has thick wax, you should use a solvent to clean the paint surface thoroughly before polishing. Polish with a finer polish or a coarser polish, depending on the depth of the watermark. In the case of particularly serious watermarks, the watermarks will reappear after a few days of polishing, and the cleaning and polishing procedures should be repeated several times to completely eliminate the watermarks. If repeated polishing is ineffective, wet sand the watermarked area with fine-grit sandpaper and repaint.
