5.2TROUBLESHOOTING FINISH PROBLEMS
Problem |
| Probable Cause |
| Solution(s) |
|
|
| ||
Runs or Sags | A. Coating has been over- | A. Add undiluted material and | ||
|
| diluted |
| mix thoroughly; flush gun |
|
|
|
| with new mixture |
| B. | Application speed too slow | B. | Increase application speed |
| C. | Improper overlapping | C. | Overlap passes by up to 50% |
| D. Needle and Fluid Tip too | D. Check material viscosity; | ||
|
| large |
| refer to Sec. 3.3 for proper |
|
|
|
| selection |
| E. | Film thickness is too thick | E. | Consider spraying too |
|
| for one coat |
| thinner coats |
| F. | Gun too close to surface | F. | Spray |
|
|
|
| to be coated |
| G. | Insufficient atomizing air | G. | Increase turbine air volume |
|
|
|
| output using VSC; experiment |
|
|
|
| with different Air Caps |
“Orange Peel”: | A. | Insufficient dilution | A. Check viscosity; add | |
Finish has the texture of an |
|
|
| thinning solvent |
orange peel. A dimpled | B. | Incorrect thinning solvent: | B. | Use slower thinning solvent |
appearance, often very glossy. |
| solvent is evaporating too fast |
| or retarder |
| C. | Gun too far from surface | C. | Spray |
| D. | Film thickness is too thin | D. | Apply a “wetter” coat |
| E. | Incorrect amount of | E. | Adjust turbine air volume |
|
| atomizing air |
| output using VSC; experiment |
|
|
|
| with different Air Caps |
| F. Ambient air temperature too | F. | Reduce air temperature in | |
|
| high |
| spray area and/or add |
|
|
|
| retarder to coating being |
|
|
|
| applied |
“Fish Eyes”: | A. Contaminant on the surface | A. Very difficult to correct once | ||
Small round depressions in the |
| (oil, moisture) preventing the |
| surface is sprayed. Ensure |
paint film. Normally form as |
| coating from adhering to the |
| that surface is clean, dry and |
soon as part is sprayed. |
| surface in certain spots |
| free from any contaminants |
|
|
|
| prior to spraying |
“Dry Spray”: | A. Gun too far from surface | A. Spray | ||
Surface is dull and rough. Dry | B. | Incorrect amount of | B. | Adjust turbine air volume |
paint particles protruding from, |
| atomizing air |
| output using VSC; experiment |
or sitting on surface. Unlike |
|
|
| with different Air Caps |
Orange Peel, Dry Spray is always | C. | Incorrect thinning solvent: | C. | Use slower thinning solvent |
low in gloss. |
| solvent is evaporating too fast |
| or retarder |
| D. | Film thickness is too thin | D. Apply a “wetter” coat | |
| E. | Application speed too fast | E. Slow down speed of motion | |
“Blushing”: | A. | High humidity in the spray | A. Reduce humidity in spray | |
Large whitish areas in the finish |
| area: moisture has condensed |
| area and/or add retarder to |
|
| in the coating as it was being |
| coating being sprayed |
|
| sprayed. |
|
|
| B. | Incorrect thinning solvent: | B. | Use slower thinning solvent |
|
| solvent is evaporating too fast |
| or retarder |
For all other problems, please contact your local HERO distributor or HERO directly
HERO Operator’s Manual – Page 20 of 23
