Use elastomeric coatings when you need a waterproof, crack-bridging finish for stucco and masonry during exterior house painting.

Elastomeric coatings are thick, highly flexible coatings formulated to stretch and return so they can bridge hairline cracks and protect weathered masonry from water intrusion. Start by assessing substrate moisture with a moisture meter and delay work if readings are above manufacturer limits, because trapped moisture ruins adhesion and causes blisters. Clean surfaces thoroughly with a pressure washer and a mild detergent, removing loose paint, efflorescence, and salts, and allow full drying; use a masonry cleaner for heavy staining. Prime each substrate with the manufacturer recommended primer type and allow proper cure time, because different substrates like concrete, fiber cement, or existing acrylic coatings need compatible primers. Apply elastomeric with rollers or plural component sprayers at the specified dry film thickness and use wet film gauges to confirm coverage since these coatings must be applied in multiple coats to meet thickness per the data sheet. Work in moderate temperatures and low humidity and follow pot life and recoat windows, because poor timing produces tacky or soft films; maintain manufacturer temperature and humidity limits. For texture matching, use the same application tool and roller naps across the job and feather feathered edges to avoid lap marks.

The most common mistake is applying over damp or salt contaminated masonry which causes adhesion failures; always test for moisture and clean efflorescence before priming. Another frequent issue is insufficient thickness leading to inadequate crack bridging and premature failure; measure wet film thickness and plan multiple coats to reach the required dry film thickness listed by the manufacturer. Third, people assume elastomeric breathes like acrylics and trap moisture in masonry, producing blistering; mitigate this by confirming low substrate moisture, allowing thorough drying after cleaning, and choosing breathable primers when available.

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