Eco-friendly Nano-Gard 100 clear sealer penetrates concrete slabs and foundation walls to waterproof and protect. It forms hard silicate structures that close pores within concrete, leaving a harder, denser surface with high resistance to chemical attack and abrasion. Concrete remains breathable, and the sealer can be used indoors or out. Also available is Nano-Gard 100 ST hydrophilic, water-repellent formulation, and Nano-Gard 100 Plus hydrophobic formulation that also prevents efflorescence. Gemite Products Inc.