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Decorating Defects - their cause and cure
Settling
The term" settling," applied to a paint, implies the separation of the
vehicle, or liquid portion, from the pigment.
The defect may often be observed when a paint has been standing in the container for some time, the extent to which it occurs depending upon the fineness of grinding, and also upon the specific gravity of the pigment; the more finely the pigment is ground the more likely is it to remain in suspension, and modern readymixed paints exhibit far less tendency to settling on this account.
When paint made up by the decorator is used, consideration should be given to the fact that if two or more pigments have been employed to obtain a certain shade, their specific gravity may be widely different, with the result
that the heavier will naturally tend to sink to the bottom of the container.
Consequently, unless thorough amalgamation takes place before the paint is applied, the material may vary not only in consistency but also in shade.
The importance of thorough and systematic stirring of all finishes before application cannot be over-exaggerated.