MasonryDefender Interior/Exterior Brick Sealer is a durable, water-based, clear, acrylic sealer designed to seal interior or exterior brick & masonry walls, giving them a slight satin sheen. This masonry sealer is formulated with a durable acrylic resin that reduces water penetration on exterior walls, and minimizes brick dust on interior walls making brick walls easier to clean and giving them an attractive satin sheen. MasonryDefender Interior/Exterior Brick Sealer can be used on most types of above-grade, vertical, interior or exterior masonry surfaces including: brick, stone, stucco, adobe, and moderately dense substrates. It can be used as both an interior brick sealer, or an exterior brick sealer and provides a slight satin sheen. If cleaning is necessary on exterior surfaces, use MasonryDefender All Purpose Masonry & Concrete Cleaner.