Its protective properties safeguard the substrate from degradation. Its decorative properties allow the paint to retain its attractive appearance. The ability of paint to expand and contract with the substrate without suffering damage or changes in its appearance. Expansion and contraction are usually caused by temperature fluctuations. Some substrates such as yellow pine expand at different rates depending on the type of their grain.
Elasticity is a key to durability.
Acrylic binders are noted for their elasticity. A less-expensive ingredient than titanium dioxide that fills out and extends the pigment's capabilities. Extender cannot be used without pigment. Some common extenders are clays, calcium carbonate, and silica. Lightening of the paint's color, usually caused by exposure to light or heat.