When wires become entangled they are safety hazards, for both the equipment and the owner. Gardner Bender offers a variety of products for protection and neatness. As the needs of professional electricians change in managing wire and cable, Gardner Bender continues to deliver innovative solutions. Insulate and splice electrical wires with the Gardner Bender 4 fl. oz. Black Electrical Tape. This tape provides a waterproof seal and is formulated to resist unraveling and deteriorating like traditional electrical tape. Fast drying formula.