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Common Causes and Solutions for Coating Defects

2025年10月28日
Defect NamePhenomenonReasonSolution reference plan
Shrinkage cavityThe appearance of small circular pits or tiny white spotsThe substrate has oil stainsClean the substrate
Add improper diluent  Replace the thinner
The temperature is low, making it difficult for the paint to level smoothly.Preheat the substrate to 35-50°C before construction
There is water, oil, etc., in the air pipe or spray gun.Drain water and remove oil
ThickenIncreased paint viscosityEvaporation of the diluent during storageKeep sealed to prevent solvent evaporation.
High storage temperatureStore at 25°C in an air-conditioned room
Storage time is too longFirst in, first out; use within the expiration date
precipitationSediment and clumping appear at the bottom of the barrel.The solid components settle during storageStir or roll the paint frequently
Coarse grains, granulesThe coating surface has a granular appearance.The substrate is uneven and has burrs.Substrate surface treatment and leveling
There are impurities in the paintSelect the appropriate filter screen for filtration
There are dust particles in the painting and baking environmentClean spray and baking environment
Moisture absorptionAfter spraying, water droplets form on the surface of the wet film; water stains and mottling appear on the surface.The coating is easily absorbentChoose dry weather or environment for spraying
Preheat the substrate to 35-50°C before construction
After coating, put it into the oven as soon as possible.
Expose one’s bottomThe phenomenon of exposing the substrate colorCoating is too thinAdjust to the appropriate viscosity
The paint has poor coverage.Choose a paint with good coverage
Excessive dilution of paint during constructionSpray to the appropriate film thickness
FoamingBlistering appears on the surface of the coating after sinteringThe substrate is not cleaned properly and has grease.Degreasing
The temperature rises too quickly, causing the solvent to evaporate instantly.Reset the baking process
Too thickly sprayedControl spray thickness
The paint application viscosity is too highReadjust the spray coating viscosity
Peeling, poor adhesionPoor coating adhesion, phenomenon of detaching from the substrateThe substrate is not properly cleaned and has oil.Degreasing
The sintering temperature and time are incorrectCheck the furnace temperature and sintering time
Orange peelSurface defect where the paint film exhibits an orange peel appearanceConstruction viscosity is too highAdjust the coating viscosity
Spray atomization, inappropriate pressureAdjust air pressure and atomization
Hanging flowA coating with uneven thickness at the lower edge is formed as the wet paint film moves downward into various shapes.The paint application viscosity is too lowAdjust the spray viscosity, oil output, and pressure
Too thickly sprayedAdjust the coating thickness
Low temperature or smooth substratePreheat the substrate to 35-50°C before construction
Apparent differencePhenomena of coating dullness, yellowing, or darkeningThe oven or tunnel furnace has poor exhaust ventilation.Improve ventilation
The sintering temperature or time is incorrectCheck the furnace temperature and sintering time
The coating thickness is too thick or too thinAdjust the spray coating thickness