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If is a 21FJP22 it is bonded all the way over the front of the tube with PVA (polyvinyl acetate) resin. If it is a 21FBP22 it is like you say...the safety glass is only attached around the edges.
I have not done the heat gun trick myself but when you are done, you end up with a setup like a 21FBP22...no bonding between safety glass and tube faceplate. You just attatch the safety glass back on around the edge with tape.
I know Andy has experience with the heat gun, there is a very recent post on the topic on one of these threads.
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