How to recognise them

Cissing and dimpling (sometimes known as “Crawling” or “Fisheyes”) are very small circular defects, where the paint has receded to expose the underlying substrate or coating. If the central underlying substrate area is visible, the defect is known as cissing. If the central underlying substrate area is not visible the defect is known as a dimple. The defects are usually around 1-3mm in diameter and are normally visible straight after application. Cissing is normally visible straight after application.

Causes and how to prevent them

• Sand and thoroughly clean the surface. Before repainting, try and eliminate the original cause of contamination.

How to recognise them

Formation of small bowl shaped depressions in the paint film – not to be confused with cissing/dimpling as causes are different.

What causes them

Trapped air or solvent bubbles which have burst to leave small craters as the coating dries.

Prevention

• Check for pinholes or porous surfaces that may have released air.
• On timber, try painting or varnishing later in the day. As the surface cools down, air is pulled into the timber rather than pushed out by increasing temperatures.
• Addition of the recommended retarder thinner may give the air time to fully escape before the paint has cured too far.
• Allow mixed paint to sit for longer so any bubbles can disperse before use.
• Try changing your roller or brush type.

How to treat them

Try and eliminate the cause before sanding back and repainting.