| | Aerospace; Marine; Wood |
When the upper coat is discolored by the lower coat diffusing into it.
| | | Aerospace; Marine; Wood |
White milky appearance on film. Caused by thinners evaporating too fast in high humidity. Water condenses on cold surface. May disappear on heating. Polar solvents can help in reducing or eliminating.
| | | Aerospace; Marine; Wood |
White milky appearance or haziness in film caused by the condensation of water on the surface. Caused by thinners evaporating too fast in high humidity. May disappear on heating. Polar solvents can help in reducing or eliminating.
| | | Aerospace; Marine; Wood |
Formation of a friable powder on the surface of a coating giving a chalky appearance. Caused by disintegration of the binder by weathering (oxidation and or UV degradation) and release of the pigments and/or extenders at the surface. The "Chalk" can be removed from the surface by rubbing which reveals the original colour beneath. If left the chalk will generally reappear.Formation of a powdery surface while spraying. This caused by too much fine overspray usually from too high a pressure at atomisation and thinners evaporating too fast between the gun nozzle and the job. The fine aerosol formed looses its solvent and is deposited in an almost dry form on the surface. Poor air extraction exacerbates the problem. The preferred term is "DRY SPRAY".
| | | Aerospace |
Small holes in the surface. Caused by oil, grease or substrate contamination.
| | | Aerospace; Marine |
The tendency of the paint film to recede from areas usually caused by a dirty substrate.
| | | Aerospace; Marine; Wood |
The assessment of the gloss level of a coating system by the sharpness of an image reflected.
| | | Aerospace; Marine; Wood |
The loss of colour caused by a change in the colourant used in the film (pigment or dye). Generally the colour becomes lighter but any more resistant colourants will dominate.
| | | Aerospace; Marine; Wood |
Small holes in the surface. Caused by oil grease or silicone contamination.
| | | Aerospace; Marine; Wood |
Pigment settlling that causes a uniform color change
| | | Aerospace; Marine; Wood |
The separation of pigments that result in a mottled, blotchy or streaked appearance in the paint film
| | | Aerospace; Marine; Wood |
The formation, in the can, of gaseous products in a coating material, due to the reaction between two or more constituents of the coating material or between the latter and the metal of the container. Occurs in paints containing aluminium metallic pigments if moisture is present or acidity is too high or catalysts exposed to high humidity
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