Gardner Bender LTB-400 4 oz Black Liquid Electrical Tape

What it is and who it's for

Gardner Bender LTB-400 is a 4 oz brush-on liquid electrical tape that insulates and protects splices and connections. It suits electricians, automotive technicians, marine installers and DIYers who need a waterproof coating for indoor or outdoor repairs. The liquid format conforms to irregular shapes where traditional tape may not adhere well.

Practical limits of the liquid format

The coating creates a dielectric seal that resists moisture, salt and vibration better than vinyl tape, which can unravel over time. Curing speed depends on ambient temperature and film thickness, so plan for adequate drying before re-energising a circuit. The brush-on applicator limits use to accessible joints; it cannot reach inside sealed conduit or behind fixed panels.

Capacity and headroom

A single 4 oz container covers multiple small splices but will run out on large harness-wrapping jobs or continuous heavy-duty coating. The black finish blends with standard insulation colours and resists UV degradation for outdoor runs. It is not a structural adhesive and cannot replace mechanical connectors or heat-shrink tubing where strain relief is required.