About car paint wire
That is, the reflection of silver powder is uneven. The silver powder particles are arranged in the same direction, showing light and dark stripes. In most cases, the deposited silver powder will puncture the paint film if wire run-off occurs on vertical surfaces.
(1) Cause:
①Silver powder paint is a mixture of pigments, solvents, metal particles with a certain size and additives. The distribution ratio of metal particles in the pigment will affect the color of the paint surface. If the silver powder paint is not fully stirred evenly before spraying, metal particles will be deposited on the bottom of the container, resulting in too many metal particles in the paint at the bottom, making the paint film too thick and uneven paint color.
②The viscosity of the paint is incorrect, that is, the ratio of the thinner is wrong. If the amount of thinner is too much, the drying speed of the paint surface is very slow, and the metal particles are easy to aggregate, which is prone to the phenomenon of wire running. However, if the amount of thinner is too small, the quality of the paint film will be poor, and an appropriate viscosity that can take into account both requirements must be selected.
③ The time interval of each spraying is too short. If the silver powder paint is not fully dried, uneven distribution of metal particles will occur.
④ Improper adjustment of the spray gun or poor painting technique. If the compressed air pressure is too low, or the distance between the spray gun and the sprayed surface is too close, or the speed of the spray gun is not uniform, it will cause the phenomenon of light and dark on the surface of the silver powder paint.
(2) Correction method:
Re-spray the paint surface after water grinding with fine sandpaper, or increase the compressed air pressure after the paint surface is completely dry, increase the distance from the spray gun to the sprayed surface to 40-50 cm, and then spray a layer of silver powder paint with quick-drying thinner.
