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1. Quality issues with the paint;
2. The coating is too thick during application;
3. Environmental impacts during construction;
4. If the surface of the object to be painted has residual oil, acid, alkali, salt, etc., and is not thoroughly cleaned before applying the primer, and the primer is not completely dry before applying the topcoat, it can cause local slow drying or stickiness, and sometimes even remain wet for a long time;
5. During construction, insufficient addition of hardener for two-component paint, insufficient drying of drying-type paint, etc.;
6. When applying new paint over an old coating, contaminants on the old coating can affect the normal drying of the paint surface.

1. The formulation and production reasons of the coating. Improper selection of solvents and mixing ratios, poor dispersion of pigments and fillers, and the inclusion of air bubbles and moisture during the production of coatings.
2. Storage temperature is too low, causing poor miscibility of the resin, increased viscosity, or local precipitation, which can easily lead to particles or pinholes.
3. Prolonged vigorous stirring introduces air into the coating, generating countless bubbles.
4. High humidity in the construction environment, malfunction of the oil-water separator in the spraying equipment, unfiltered air, and moisture being carried into the spray during spraying can cause pinholes and even blisters.
5. Excessively high pressure during spraying and too far a distance disrupt the solvent balance of the wet paint film.
6. Solvent evaporates too quickly after coating, or construction is done at higher temperatures, especially under high-temperature baking, causing the paint film itself to not be able to fill the gaps in time, resulting in pinholes.
7. Improper surface treatment of the object being coated, painting on a surface with oil stains. 8. The paint film is sprayed too thickly in one go, preventing the solvent from evaporating in time, which gets trapped in the coating and forms pinholes when it eventually evaporates after some time.

1. Issues with paint production formulas and processes, such as insufficient resin content or poor polymerization, excessive amounts of pigments and solvents, poor compatibility of resins, and insufficient fineness of the paint.
2. Improper treatment of the substrate, with surfaces that are too rough and contaminated with oil, moisture, wax, etc.
3. The paint was not sufficiently stirred, causing resins to settle at the bottom. During application, the upper half of the bucket has less pigment and more resin, resulting in a glossy finish, while the lower half has more pigment and less resin, leading to a matte finish. Excessive addition of thinners dilutes the effect of the glossy paint.
4. Applying paint in cold, humid weather can cause moisture to condense on the paint surface, resulting in loss of gloss.
5. The topcoat film is too thin, and uneven application can also cause loss of gloss.
6. Spraying the topcoat before the primer or putty layer is completely dry, or polishing the topcoat before it is dry, can also lead to loss of gloss.
7. Using inappropriate solvents for baking paint, especially fast-evaporating solvents, or placing items in the baking equipment too early, or drying at excessively high temperatures, or insufficient ventilation during drying can all easily cause a decrease in gloss.

1. High paint viscosity: When the viscosity is too high, the paint has poor flowability and is prone to orange peel.
2. Poor solvent solubility: The choice of solvent has a significant impact on the leveling effect of the paint film. Using a solvent with weak solubility can lead to the formation of orange peel.
3. High environmental temperature: In a high-temperature environment, the solvent evaporates too quickly, and the paint dries before it can level, resulting in orange peel.
4. Improper spraying pressure: Low spraying pressure can lead to insufficient atomization of the paint, resulting in granular orange peel; high pressure may cause wrinkles on the paint surface, affecting the leveling effect.
5. Uneven substrate treatment: A rough or uneven substrate surface can affect the leveling effect of the paint film, leading to orange peel.
6. Insufficient leveling time: If the leveling time after spraying is insufficient, entering the drying room too early can cause the paint film to not level adequately, resulting in orange peel.
7. Improper spraying distance and speed: If the distance between the spray gun and the object being painted is too far or the spraying speed is uneven, it can lead to an uneven paint film, resulting in orange peel.

1. During the production of coatings, the grinding of pigments and fillers is not fine enough, failing to meet the specified fineness; during the storage of coatings, gelation occurs without filtration or other treatments; when the skin of the coating breaks into fragments after shaking and mixes into the coating, the coating deteriorates.
2. Before painting, the thinner used to dilute the coating is not compatible with the coating.
3. The spray gun is not cleaned, and the solvent causes the paint skin in the spray gun to peel off, forming residues that mix into the coating.
4. During spraying, if the distance between the spray gun and the surface to be coated is too far, the paint mist has not yet settled on the surface, and the solvent in the coating has already evaporated, causing the coating to lose its fluidity and form particles.
5. When spraying, if the diameter of the spray gun is small and the pressure is high, it can also cause the ejection of coarse particles.