Hardwood floors usually have a polyurethane sealer this give the flooring a desired sheen and it protects the floor from scratches and staining from moisture when cleaned up in reasonable amount of time. When cats and dogs leave urine spots on wool area rugs it could take weeks before it actually dries. If the rug is on top of a wood floor the moisture, acid and salt in the urine will destroy the protective finish and the odor will permeate into the wood. This will sometimes leave dark stains to the wood floor. The odor can’t be cleaned out so we seal the odor in. One mistake made by others is that they reseal using the same product made to finish wood floors. if this type of sealer could not keep the urine from permeating into the wood floor how can it be serve as a barrier to keep it from coming out. Our odor barrier sealer resist acid, salt and moisture it also has a vapor barrier and stops odors 24 hours after applying. Our pet odor removal specialists use these for removing cat odor and dog odor.