I have two vintage fish tanks. One is marked Metaframe the other is not marked. The one that is not marked has a slate bottom and chrome edges. Who do you think makes the unmarked tanks. Does Metaframe have unmarked tanks?
I'm old enough to remember when that's all you could buy, and even when new, they had a tendency to leak. So the first step was always to fill it up and wait a few days to see if you got a good one. Having said that, if they didn't leak initially, you were generally good to go for years.
I've never tried it but you could probably easily reseal a vintage tank and after all the years, I'm not sure I'd trust the orignal aquarium "cement" to be watertight.
There were a lot of Metaframe copycats back in the day, because, at the time, building a tank was not the "rocket science" it is to most companies today, lol! I would say the lack of marking just shows it was not a Metaframe tank. No way would I trust the old sealant, if you're going to use them, as it was a lot like roofing tar --- had a tendency to bubble under a seam & leak, & it gets brittle over time & will break out. My paternal grandfather used to make his own metal frame tanks & changed to the "new" silicone sealant as soon as it came out, re-sealing his whole houseful of tanks.
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