Conducting Varnish is used to damn / suppress corona discharge in high voltage motor. 3 A Associate Incorporated is an ISO 9001-2008 awarded company that manufactures Conducting Varnish. 3 A Associate Incorporated also manufactures a wide variety of electrical insulation materials. Conducting Varnish is brushed over straight portion of the coil. It has excellent adhesion on mica, fibreglass paper and ceramic product.