Abstract: An electric arc metalizing apparatus includes a wire drive unit within a housing unit, a device for attaching at least two spools of wire within the housing unit such that the wire can be led through the wire drive unit, a spray gun spatially moveable with respect to the housing, the wire drive unit having at least one drive roller advancing the wire to the spray gun, the drive roller having a knurled surface engaging the wire for avoiding slippage and removing contaminations like corrosion layers, and within the housing unit at least one wire cleaning/lubrication mean position downstream from said drive unit.