This video shows your the method, tools and best of all, a few tricks to get a good Tesla Coil secondary coil varnish job done! This is something everyone can do, from a cheap battery drill to a expensive servo/stepper motor winding rig, its about the skill and not just expensive tools. You can do it!
This is the secondary coil from my first DRSSTC, the Kaizer DRSSTC 1. As it was built 12 years ago, I figured that a fresh layer of varnish would not hurt it. Got some how to varnish a tesla coil tips to share? Join the high voltage community!
This video also got featured on hackaday: https://hackaday.com/2022/08/09/junkbox-build-keeps-tesla-coils-perfectly-varnished/