Which material is least likely to chalk when painted on an exterior wall?

Which material is least likely to chalk when painted on an exterior wall?

• A. ACRYLIC
• B. VINYL
• C. ELASTOMERIC
• D. ALL OF THE ABOVE

Answer: (C)

Chalking happens when the binder in a paint film breaks down under UV light and weather, leaving a powdery residue on the surface. Elastomeric coatings form a thick, flexible film with durable binders, which resist UV-driven breakdown and stay intact longer, so they’re less prone to producing chalk compared with other exterior paints. Acrylic paints can chalk as their binder degrades with sun exposure, shedding resin particles over time, while vinyl paints may also chalk depending on formulation and UV resistance. So, the elastomeric coating is least likely to chalk on an exterior wall.

Chalking happens when the binder in a paint film breaks down under UV light and weather, leaving a powdery residue on the surface. Elastomeric coatings form a thick, flexible film with durable binders, which resist UV-driven breakdown and stay intact longer, so they’re less prone to producing chalk compared with other exterior paints. Acrylic paints can chalk as their binder degrades with sun exposure, shedding resin particles over time, while vinyl paints may also chalk depending on formulation and UV resistance. So, the elastomeric coating is least likely to chalk on an exterior wall.