Chalking
Definition
The powdery residue left on the surface of paint when ultraviolet light breaks down the binder that holds the pigment together. Run a hand down a chalked wall and it comes off on your palm like coloured dust.
Why It Matters
At 4,000 to 4,500 feet across Fernley, Reno, Sparks and Spanish Springs there is roughly 10 to 15 percent more UV than at sea level, so chalking is the most common way exterior paint fails here. It always starts on the south and west elevations. Paint applied over chalk without washing and priming first will peel within a season.
Simple Example
A ten-year-old tan stucco house in Spanish Springs: the north wall still looks new, the south wall leaves tan dust on your hand. That south wall needs washing and a bonding primer before it is repainted.
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