Abstract: A method for repairing faults or defects in the insulation of insulated wire is disclosed together with an apparatus for operation of the method. The method comprises passing insulated wire to be tested for insulation faults at high speed through a fault detector. This fault detector senses the presence of a fault or defect in the wire insulation. Upon sensing a fault, the speed of the wire passing through the apparatus is considerably slowed and the area having the fault is passed through a second fault detector which locate the essentially exact spot of the fault. Thereafter, the wire is automatically moved at the slowed speed through various repair stations where a plastisol coating is applied to the fault, spread evenly over the fault area, cured and then cooled. The cured plastisol repairs the fault and the wire can then proceed at high speed through the apparatus until another fault is detected.