| Cause | Solution |
| Improper degreasing. | Use Xtend Prep 102 or 300 and rinse thoroughly. |
| Under-exposure. . | Re-evaluate exposure time to fully harden stencil. Check lamp age, type and brand. |
| Improper wash out. |
Water too warm (do not exceed 40°C). Decrease water pressure. |
| Uneven coating. |
Use properly
tensioned screen. |
| Incorrect coating with respect to mesh count | Re-evaluate coating thickness. |
| Improper mixing of Diazo in diazo or dual cure emulsions. | Mix thoroughly. |
| Emulsions shelf life has been exceeded. | Date when sensitised - store as directed in the product information sheet. |
| Emulsions not dry before exposure. |
Allow screen to dry thoroughly before exposure. Control humidity in screen room by using drying box and/or dehumidifier. |
| Dirt or dust accumulated on coating during drying. | Keep drying area as clean and as dust free as possible. |
| Dirt or dust on positive or vacuum frame glass. | Clean positives and glass with a recommended cleaner. |