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I've got a tube soaking now - Channel master rebuild 21FBP22. Yes. It's got a faceplate - weird, huh?
Anyway, after about 2 (or was it three?) weeks, it's very obviously starting to come apart - the material at the edge has debonded entirely from the glass. Interestingly, it's also become quite brittle (the ambient water temp - mid 50's - might be a factor too?). There's a few inches in the center that are obviously bonded, and I'm pretty sure that after a few more weeks, it'll let go.
It seems the plasticizers get leeched out by the water, and it just lets go from the glass. It's certainly a slow process (maybe warmer water helps?), but it seems to be making progress.
I'm getting really curious as to WHAT this stuff is...
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