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Pin-Holing or Bubbling
When tiny holes are produced on the finished surface, often arising from the substrate, the defect is called Pin-holing or Bubbling.
Possible Causes |
Solutions |
| Atomized water in the air | Clean the air separator and drain water from the line |
| Fine drops of moisture coming through the separator in the spray apparatus | Clean spraying equipment and purge the separator |
| The open pore of wood has air trapped inside | Use a thin wash coat to penetrate the pore |
| Production of fine bubbles after force drying |
• Use lengthened and recommended flash time, before drying. • Reduce the heat in the drying room. |
| Bubbling of Carbon Dioxide from polyurethane causes pin pricks to appear |
• Happens when polyurethane reacts with moisture. • Use retarder and apply successive thinner coats. |
| Drafts Causing Surface drying and forcing the solvent to break through the surface film and Evaporating to leave pin pricks | Avoid drafts, reduce viscosity or retard dry the material. |
| Trapping of air by heavily viscous paint | Thin the paint |
| Heavy film | Use thinner coats |