Surfactants and other small molecules then adsorb onto the substrate in competition with water. As water evaporates the binder polymer begins to fuse with the substrate. Adhesion of latex paints develops as polymer diffusion, interdiffusion and conformational changes occur. It is common for adhesion to develop and improve over the first several weeks of a coating's life. Low temperatures and damp or wet conditions prolong the development of adhesion.
Water competes strongly with polymer for adsorption onto substrates.
Wet adhesion of coatings is consequently generally poorer than when dry. Premature wetting of an incompletely cured latex paint will frequently cause blistering. Redrying of the coating usually results in substantial recovery of adhesion and appearance. As with prolonged drying times, it is likely that coatings suffering early blistering will never achieve their normal durability. Using latex paints in winter is a growing reality.