Aquron SPT-1200 is a clear, penetrating treatment for sealing and preserving brick, slate, stone, concrete, and stucco. This waterborne waterproofing reduces mold, mildew, and algae growth, while retarding efflorescence. It resists cracking and spalling from successive freeze-thaw cycles, and conditions the surface for subsequent applications of paint, stains, or other coatings. Aquron Corp. 800-342-4649.