Sag: When the paint is applied to a vertical surface, the wet paint film moves downward due to its poor sag resistance or improper application, and the paint film is too thick, resulting in thick and uneven lower edges of various shapes. coating. Causes: ①The operation is not good, the gun is too large; ②The coating is too thin; ③The surface of the coating is too smooth; ④The coating is too thick.

Whitening: refers to the phenomenon of milky white sometimes appearing on the paint film during the drying process of the glossy paint. Causes: ①The water concentration is too high; ②The resolving power of the solvent is not enough;  ③The moisture content of the substrate itself is too high;

Wrinkle: Refers to the number of regular small-amplitude corrugated wrinkles on the paint film, which can be deep to part or all of the film thickness. Causes: ①The drying speed of primer and topcoat is inconsistent; ②The coating is too thick and the viscosity is too high; ③The nozzle is not adjusted well; ④Too much coating curing agent is added, and the drying speed is too fast.

Orange peel: Refers to the surface disease of the paint film with an orange peel-like appearance. Causes: ① poor leveling; ② high temperature; ③ too much thinner or not matching; ④ uneven substrate or poor handling.

Bite: Refers to the phenomenon that when the same or different kinds of coatings are applied on the dry paint film, the dry film under it softens, rises or detaches from the substrate during the application or drying of the coating. Causes: ① Two kinds of primers and topcoats that do not match; ②The primer is painted before it is completely dry; ③The coating of the primer is too thick.

Pinhole: refers to the existence of fine holes similar to needles in the paint film. Causes: ① Air is generated inside the paint when stirring evenly; ② Oil and sewage are polluted; ③ The surface of the coating is uneven; ④ If the spray is too thick, the solvent is not easy to volatilize.

Blistering: refers to the gas such as air or solvent vapor or both bubbles formed during the coating process. Causes: ① The coating has moisture; ② The paint has moisture; ③ The air humidity is high; ④ Oil stains; ⑤ The thinner and curing agent are not matched;

Rough surface: Causes: ①The construction environment is too dirty and not clean enough; ②The fineness of the coating itself is not enough, and there is dirt on the surface of the coated object; ③The coating is not enough.

Cracking: refers to discontinuous changes in the appearance of the paint film. Causes: ①The coating is too thick; ②The coating is too thick, and the coating itself has high hardness and brittleness; ③The thinner dissolves too poorly; ④The solid content of the topcoat is low, the resin itself has problems and the external environment.

Running oil: Causes: ①There is water or oil residue in the coating; ②The coating has oil residue or wax; ③The viscosity of the coating is too high or too low; ④The substrate is too smooth.

Exposed bottom: Causes: ①The coating is too thin, the spraying is uneven, the bottom is shallow and the bottom is shallow; ②The product is too diluted, resulting in a decrease in hiding power.

Granulation: Causes: ①Too much dust or impurities; ②The coating contains impurities and is not filtered; ③Uneven stirring, not fully mixed; ④Irregular spraying; .

Yellowing: Causes: ①Direct ultraviolet rays; ②Influence of environmental factors and air; ③Excessive baking temperature of the paint; ④The color of the thinner is dark.

Tackback: After the coating dries, the surface of the paint film is sticky again. Causes: ① Lack of air circulation; ② High humidity; ③ Packing and processing before the paint is completely dry; ④ The thinner volatilizes too slowly and remains.