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Based on a tip from a viewer, KCNC investigated the toxicity of a bathroom tile sealant called Tile Perfect Stand 'N Seal. They found numerous complaints from across the country about the sealant making people ill. The safety labels on the cans did not match the sealant producer's internal documents about product safety. The producer, called Roanoke Companies, announced a recall of 300,000 cans of sealant on the day the story aired.