A method is disclosed in which a self-healing layer is disposed over a conductive connection interface between a conductive terminal and a conductive cable core. The self-healing layer is the product of a free radical polymerization reaction of a coating composition that is applied over the conductive connection interface by depositing a coating by spray application of a fluid coating composition having a viscosity of 200 to 2500 centipoise over the conductive connection interface. The coating composition comprises (1) a polymerizable compound comprising an unsaturated bond and (2) greater than 4 parts per hundred by weight of a free radical photoinitiator, based on the total weight of polymerizable compound.