As the paint's binder, acrylic resins enable the coating to last longer and retain its color. Other binders which may be added to reduce cost or add specific properties includestyrene, epoxy, and poly-vinyl acetate. Generically, resins resulting from the polymerization of derivatives of acrylicacids, including esters of acrylic acid, methacrylic acid, acrylonitrile, and their copolymers. Also known as acrylate resins. The ability of dry paint to remain on the surface without blistering, flaking or cracking.
Adhesion is probably the single most important property of paint.
Wet adhesion, the ability of dry paint to adhere to the surface in spite of wet conditions, is particularly important for exterior house paints. The effect is often aided by the vaporization of the solvents, especially if the paint has been previously heated. Alkyds offer good leveling properties and cure to a relatively durable film, but tend to yellow interior and embrittle with age. Color and gloss exterior is only fair, and alkyds are highly prone to failure exterior on surfaces containing even moderate levels of moisture. Chemically, alkyds are synthetic resins formed by the condensation of polyhydric alcohols with polybasic acids.