WHITE DISCOLORATION SPOTSThe appearance of white spots or white
discoloration on or below the surface of the coating. |
| PROBLEM |
SOLUTION TO PROBLEM |
AVOIDING PROBLEM |
| MOISTURE / HIGH HUMIDITY - The presence of moisture in the substrate
or high humidity can cause some materials to discolor. |
For mild discoloration try a vinegar rinse, otherwise remove or re-apply
another coat if the coating material is colored. |
Make certain that the substrate is dry and the humidity is below the
recommendations as set by the coating manufacturer. |
| CONTAMINANTS / LAITANCE - Alkaline residue or alkaline salts not
removed from the substrate can cause coating discolorations. |
The only solution for this problem is the removal of the coating and then
re-application of the material after surface preparation. |
Always check a floor after etching or surface preparation for a fine powder
residue. If present, vacuum and rinse before coating. |
| SOLVENT ENTRAPMENT - Trapping solvent within the coating can cause
white thread like discoloration below the surface. |
Clear coats can only be restored by removal and re-applying. Color coats
will need to be re-coated to restore the proper color. |
Provide exhaust ventilation as soon as the coating is tack free to remove
solvent vapors from the area of the coating. |
