Runs/Sags

Coatings that fail to adhere uniformly, causing beads, droplets, or slippage of the total film.

Common Cause

1. Over reduction and/or too slow evaporating thinner.

2. Applying paint materials without proper flash-off time between coats.

3. Applying excessive wet coats due to: ① Holding the gun too close to the surface. ② Slow gun speed. ③ Double coating.

4. Incorrect gun set-up and too low air pressure.

5. Unbalanced spray pattern.

6. Ambient or substrate temperature too low, or/and poor ventilation.

7. Surface is contaminated by oil, grease, etc. or existing paint film is not sanded.

 Repair

1. Remove the wet paint film with solvent, clean and refinish.

2. Or, after finish is completely dry. remove excess paint by block sanding with P1200 or finer grit sandpaper, compound and polish to restore gloss.

3. Or, sand to a smooth surface and refinish.