Coating Terms

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A test performed to determine whether there is a pigment flocculation or flooding in the wet paint. The paint to be tested is applied on a panel. After a short drying time (flash-off) rub-out test is carried out by rubbing the paint film with a finger while it is still damp but already starting to dry. The pigment flocs, which may present in the paint film will be re-dispersed by rubbing and the active pigment surface will increase leading to an increase in color strength of pigments. Therefore, if defects described above exist in paint film, there would be a color difference between the rubbed and unrubbed area.