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Orange Peel
When the coated surface develops a kind of finish that resembles an orange peel, the defect is termed Orange Peel. The coating is not smooth but exhibits the texture of an orange.
Possible Causes |
Solutions |
| Improper Thinning of paint |
• Choose solvents that evaporate slowly. • Use recommended amount of thinner. |
| Using Poor Grade Thinner | Use better grade thinner for material. |
| Failure to Deposit a Wet coat |
• Check solvent. • Use correct spread and overlapping of stroke. |
| Material Not Dissolved thoroughly | Mix material thoroughly |
| Presence of Drafts (Synthetics & Lacquers) | Eliminate excessive drafts |
| Presence of Low humidity, causing rapid dry conditions | Raise humidity of room. |
Defect due to problem in the Spray Gun
| Stroking is too Rapid | Stroke slowly and make deliberate slow spray passes. |
| Air Pressure is too Low in the Spray Gun | Increase atomizing pressure or reduce fluid pressure. |
| Using Wrong Air cap | Select correct air cap for the material and the feed. |
| Fluid Pressure in the Spray Gun is High | Decrease the fluid pressure |
| Holding the gun too Far from the Surface or too Near | Hold the spray gun at a distance of 6-10 inches from the surface. |
| Spraying is Striking a Wet and Sprayed surface |
• Do not over spray. • Ensure not to spray on a surface that has been sprayed already. • Spray detail parts first and end with wet coat. |
| Air Temperature is too High and Hot | Use retarder solvent to lower the temperature. |