Look at the surface of electrophoretic paint carefully and judge whether it is a pinhole. The definition of shrinkage cavity is confusing. If the definition is not accurate, it cannot provide targeted solutions.

Pinhole: it is on the same plane as the paint film, such as acupuncture, and the hole is very small.

Pore: the opening is convex upward, big or small, generally greater than 0. 1 mm ... Note: if it is caused by phosphating, the pore diameter is generally less than 0.1mm.

Water and oil holes: the opening is concave, and the aperture is generally greater than 0.1mm.

Different shrinkage cavities have different causes and solutions.

Please carefully judge the shape and size of the hole, and then I can provide you with the cause and solution of the hole.