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A product called 'slip plate' works (there are other products too). To apply it remove CRT from TV, mask off places the dag should not be, feel for loose patches of the original dag and knock loose patches off, spray new coating on over glass and solid parts of original dag making a reasonably thick complete coating, allow to partially dry (to where it won't run), remove masking, allow to finish drying.
Assuming the dag has not formed islands you can temporarily ground the dag by placing a spring or wire against a good part of the dag and connecting that wire to ground.
If the dag is not connected to ground somewhere then the outer dag can float to several thousand volts potential relative to the chassis...Once it floats high enough it will arc to ground at anyplace where it can....If you ground it somewhere decent it will be at ground potential and not arc......Now if there are dag islands all of them need to be grounded or they will arc to each other and or chassis (thus why you don't want islands: too much of a pain to ground multiple things).
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