Cracking

Cracks or lines of various lengths and widths in the topcoat finish often resembling the cracking of dried mud.

Cause:

1. Excessive film thickness of the undercoat and/or topcoat.
2. Refinishing over a previously crazed/cracked surface.
3. Insufficient flash time between coats and/or force drying undercoats using air from the spray gun.
4. Mixing incorrectly or using too much hardener.
5. Paint ingredients not thoroughly stirred or agitated.
6. Breakdown of finish due to prolonged exposure to sunlight, moisture, and extreme temperature changes.
7. Using generic reducers and/or hardeners.

Repair:

1. Remove all cracked paint film and refinish.

Prevention:

1. Apply all materials following label direction.
2. Completely remove crazed/cracked finishes before refinishing.
3. Do not force dry undercoats by fanning with spray gun air.
4. Mix ingredients thoroughly using the recommended additives. Add each component in proper sequence following the recommended mixing ratio.
5. Stir or agitate materials thoroughly before use to ensure all ingredients are in solution.
6. Use premium two component undercoat and topcoat system to provide maximum gloss and durability.
7. Use the recommended thinner/reducer and hardener, and then measure accurately.