The oil-water separation method is used to save labor and time during color filling. The method is to apply a thin layer of petroleum jelly on the convex surface after etching the convex pattern, and then spray paint. After the paint is dried, warm it with hot water at 50 ° C. .

Vaseline can be dissolved. At this time, the convex surface paint film can be scraped off with the end face of plexiglass and plastic sheet, and then fine sandpaper can be used to polish it.

The key here is that the vaseline should be thin and not spillable. When painting vaseline, place the surface of the processing graphics board in a box containing water, and the water surface exceeds the board surface (1 to 3) mm, and then evenly apply the surface of the leather or hard plastic roller Apply a thin layer of petroleum jelly and use the principle of oil-water separation to roll the petroleum jelly on the convex surface. The concave surface has water. The petroleum jelly does not roll on the concave surface and rolls only to the convex surface. After drying, spray paint, and the paint can only stick to the concave surface.