Duro-Nox LS is a lithium-based liquid floor hardener that provides abrasion and impact resistance, develops eye-catching gloss, and is engineered to eliminate the traditional requirement of rinsing and costly disposal of hazardous waste rinse residue. The product penetrates deep into concrete surface pores where it chemically reacts with calcium hydroxide (lime) to produce water insoluble calcium silicate gels that densify, harden, and seal the concrete. Nox-Crete Products Group. 402-341-2080. www.nox-crete.com