Which material will be least likely to chalk when painting an exterior wall?

Which material will be least likely to chalk when painting an exterior wall?

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

Answer: (B)

Chalking occurs when the binder in a paint film breaks down under sun and moisture, leaving a fine powder of pigment and binder on the surface. Elastomeric coatings use a durable, UV-resistant, high-build acrylic or acrylic-modified binder that forms a strong, flexible film. This combination resists binder breakdown and pigment shedding, so the surface is much less prone to generating that powdery chalk compared with vinyl or standard acrylic finishes. In other words, elastomeric coatings maintain film integrity longer, making them the least likely to chalk on exterior walls.

Chalking occurs when the binder in a paint film breaks down under sun and moisture, leaving a fine powder of pigment and binder on the surface. Elastomeric coatings use a durable, UV-resistant, high-build acrylic or acrylic-modified binder that forms a strong, flexible film. This combination resists binder breakdown and pigment shedding, so the surface is much less prone to generating that powdery chalk compared with vinyl or standard acrylic finishes. In other words, elastomeric coatings maintain film integrity longer, making them the least likely to chalk on exterior walls.