Potassium Silicate S21-MR

Potassium Silicate S21-MR coating is the most compatible paint for any masonry surface. Use on concrete, brick, limestone, brownstone, sandstone, and terra cotta. When applied directly to bare masonry, it delivers 92 % vapor permeability. This allows the substrate to breathe naturally while remaining completely colorfast. Unlike latex and acrylic coatings, this true mineral paint chemically bonds with the masonry at a molecular level for exceptional adhesion and longevity. This bonds prevents peeling, unlike paint. It combines the time-tested advantages of traditional silicate/mineral paints with the superior water-repellent properties of silicone technology, creating a durable finish that withstands extreme climate conditions and actively repels water. Dilute with Liquid Silicate and use as a mortar stain!  Note: While this coating can be applied over existing latex or acrylic paints, doing so may reduce its breathability and overall performance. Similar potassium silicate coatings have been trusted across Europe for over 160 years and are now being produced for the first time in North America. Lancaster Lime Works is proud to offer this innovative product as a non-stocking distributor. Contact us to learn more! These products are non returnable. Order a 12 oz to determine suitabilty before ordering a larger quantity.  Coverage: 1 Gallon covers approx. 240 ft² with a single coat.  Select Cathedral Stone items are drop-shipped directly from the manufacturer in Hanover, Maryland. This allows us to offer their complete line of high-performance Potassium Silicate products without maintaining large local inventories. You receive the product straight from the producer, often resulting in faster availability than traditional backorders. These orders may ship separately and will include tracking once they leave Cathedral Stone’s facility. Tech Data Sheet SDS Specs