Uses Chitosan (recycled crab shells) to form an invisible antimicrobial barrier against mold, mildew, and odors that result from mold. Thoroughly scrub surface to remove mold and mildew prior to applying Clear Shell. Low VOC, biodegradable, and contains no butyls, bleach ammonia, or phosphates. Interior exterior use. Banned in California. No. ZUCSM32: 32 oz. spray, covers 7" x 9.5" area No. ZUCSM128: 128 oz. spray, covers 16" x 17" area