Loss of gloss

A dulling of the gloss as the film dries or ages.

Cause:

1. Topcoat applied in heavy, wet coats.
2. Inadequate flash time between coats.
3. Insufficient film thickness of topcoat colour or clearcoat.
4. Insufficient drying/curling of undercoats before applying topcoats.
5. Using a poor grade and/or too fast evaporating thinner/reducer for spray conditions.
6. Improper cleaning of the substrate.
7. Insufficient air movement during and after application.
8. Spraying over a deteriorated or solvent sensitive substrate finish without proper priming or sealing procedures.
9. Natural weathering of the finish.

Repair:

1. Allow finish to cure thoroughly, compound or polish to restore gloss.
2. Or, sand and refinish.

Prevention:

1. Apply the topcoat according to product label directions using the recommended gun set-up and air pressure.
2. Allow all coatings sufficient flash between coats.
   
3. Apply sufficient number of coats to achieve recommended proper film thickness. Check with a film thickness gauge if possible.
4. Allow undercoats to thoroughly dry/cure before topcoating.
5. Select recommended thinner/reducer based on temperature, humidity, air movement, and size of repair.
6. Clean substrate thoroughly before and after sanding.
7. For air dry situations:
   A. allow exhaust fan to run 40 minutes or longer after spraying;
   B. open booth doors after finish is dust free; and
   C. maintain a shop temperature of 18° Celsius or above, especially when drying overnight.
   
8. For maximum holdout use a premium two component undercoat system.
9. Properly wash and care for the finish on a regular basis.
10. Using premium topcoat colour or clearcoat system will provide maximum gloss and durability.