Recently, Coatings Research Group, Inc (CRGI) evaluated DRYLOK® Powdered Masonry Waterproofer for alkalinity/efflorescence resistance via CRGI Test Method 74. Testing Method 74 The waterproofer was prepared according to the label directions by mixing the equivalent of 2 pints of cold water with 10 pounds of DRYLOK® powder. After mixing until smooth, the equivalent of 2 pints of cold water was added for “normal application” or 1.5 pints for “heavy application”. To distinguish between the two application conditions, a few drops of magenta colorant were added to the mixture. The mixtures were applied to a high pH substrate. A vinyl acrylic negative control was included to show absolute failure for a comparison. The block was allowed to cure at normal room conditions for three days. After the three day cure, panels were placed into a Q‑Fog under the water fog cycle (ASTM D 1735-08). Simply put – there was 1 hour of condensation, and 1 hour of dry-off at 95°F. After one week of exposure, the panels were rated for efflorescence resistance. Negative Control — Color Accents Vinyl Acrylic Paint (Sherwin Williams) – 4 DRYLOK® Powdered Masonry Waterproofer – Normal Application – 10 DRYLOK® Powdered Masonry Waterproofer – Heavy Application – 10 CRGI Test Method 74 – Rating 10= No defect observed 1 = Severe defect observed
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