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It is my understanding that only the later round color crts introduced this method of applying the safety glass. So conceivably, a 21fj without its safety glass wouldn't be any less safe than say, a 21ax. That is why early roundies have the pane of safety glass built into the cabinet.
As for how RCA applied their PVA, I found a small injection nozzle fixture on the side of the crt where it appears the PVA went in. It is basically a glorified plastic washer.
I think if I were to ever attempt this again, I would take my crt to a large controlled oven, such as those used for powder coating, and slowly bring the crt up to temp in that, pull the crt, pop off the safety glass, and then run a cooling cycle to bring it down properly. Simply copying the heating cooling protocols from a crt rebuild operation should be a fine guideline.
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