To store, handle or use flammable liquids in
excess of 6 1/2 gallons inside dwellings or in excess of 10 gallons
inside any other building or other occupancy or in excess of 60 gallons
outside of any building. This provision shall not apply to liquids
in the fuel tank of a motor, vehicle, aircraft, portable or stationary
engine, boat or portable heating plant or paints, oils, varnishes
or similar flammable mixtures, when such liquids are stored for maintenance,
painting or similar purposes.