CRT faceplates / screen "mold"

[Jules Richardson]

Many years ago I cut the faceplate off an HP display exhibiting serious 
decay of the sealant between the faceplate and the CRT itself, cleaned 
everything up, then reattached the plate just with a bead of sealant around 
the perimeter (where it wouldn't be seen once the bezel was back on).

Short of outright replacing the CRT with one of the same type, is that 
still accepted practice - or in the years since has someone worked out a 
way of applying new sealant across the entire face without getting air 
trapped in there, thereby maintaining the structural integrity of the original?

cheers

Jules