40 TREATMENT OF MATERIALS, NAMELY, ELECTROSTATIC COATING AND SPRAYING IN ORDER TO PRODUCE A DURABLE, CUT-, PUNCTURE-, ABRASION-, NON-CORROSIVE, HEAT- AND TEAR- RESISTANT SURFACE OF POLYURETHANE OR OTHER ELASTIC MATERIALS ON MOULD AND MATRIX FINISH; COATING OF OBJECTS WITH ELASTOMERIC COMPOUNDS, AND TREATMENT OF PLASTIC MATERIALS