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I have used GC corona dope with great results, but on smaller areas than this flyback.
People talk about recoating entire flybacks with RTV. If you search the forums, those discussions should turn up.
I assume the arc is jumping to the bracket because that's the closest path to chassis ground. You want to seal up the fly where the spark originates, of course (i.e., not paint over the bracket).
Again, I would not power up the set at all, or only for a very brief period, before restoring the insulation. I would inspect that flyback very carefully before covering it up. Let's hope the arcing has not damaged the flyback.
Phil
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