| Cause | Solution |
|
Dust or dirt on screen or in coating trough. |
• Keep area
clean. |
| Air bubbles caused by coating screen too quickly or air stirred into emulsion. | •
Slow coating stroke to ease friction between coating trough lip and mesh. • If stirred, allow enough time for bubbles to dispel. |
| Emulsion coating too thin for mesh mesh count. | • Re-evaluate coating thickness, add another coat of emulsion. |