and watts applied a sealer that they had bought from Standard Household Products Ltd. The label on each can of sealer contained the following warning: DANGER-FLAMMABLE Do not smoke. Adequate ventilation to the outside must be provided. All spark-producing devices and open flames (furnaces, all pilot lights, spark producing switches, etc) must be eliminated in or near working areas. Avoid prolonged breathing of vapours. Wear a vapour cartridge mask. Replace cartridge before saturation