Folks, I've been working with 60kV voltages for over...OMG..30 years. (Good Lord, am I really that old?)

Watch the video. Carefully. alaxfire told me about his issues getting his Magnacores to seat on the plugs, but didn't mention the coilpack end.

The Versachem material is the industry standard for this application. I've had a tube in my tool box for 28 of the 30+.

It offers 2 advantages:

1) makes slipping the boots on quite easy
2) provides an insulating layer for those in wet/damp climates.

"Sparingly" is the watchword here.