Coating Terms

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Solvent vapour and other gas bubbles present in wet paint film, tend to make holes while leaving the film during drying process. Drying results in an increase in viscosity, in turn, makes it impossible for paint film to level this holes out and a paint defect called pinholing defect will occur.
When the film thickness of applied paint increases, release of solvent vapour and other gases will be retarded. Since paint film starts to get hardened during this period, the holes formed by solvent vapours and other gases become permanent if the thickness of the film is above a certain limit. The dry film thickness of paint film at which this defect starts to occur is called pinholing limit.