Caring for a waterless tank

Wasn't sure if this should go in here or the DIY section.
But basically I may be getting an 8ft x 2ft x 2ft tank, I say may as I don't know how long it's been dry for. I've always been taught, and thought that a dry tank is no good as they're prone to leak. Anyway, questions.

Is it the seals that become no good or the glass itself? Is there something I can do at all? Or is it best to steer clear of it all together?
Cheers

Thanks. I wouldnt buy it with any cracks or chips of course, but a friends 40 gal tank burst a year ago. I later found out it was 2nd hand and had been empty for a few months prior to purchase.

So it's more so the seals in the aquarium which could be the issue if the glass had no major imperfections? In that case I'd probably just reseal it anyway to be safe.

Cheers