An increase in the consistency of a paint or enamel resulting in a rubbery or coagulated mass. It is caused partly by a reaction between an acid vehicle and a reactive basic pigment, which produces a soap formation.

An increase in the consistency of a coating material while in the package to form a viscous, rubbery, liver-like mass. This can be caused by a chemical reaction between various ingredients or a change in the colloidal nature of the product.