I plastidipped the back of my previous tank.
I ran it for about 4+ years and it held up fine.
If I recall I pretty much used most of a can on the back of a standard 65. So that's about 6 sf. So I guess you could decently cover 8sf or maybe even 10sf with one can.
If I had purchased a tank that didn't have an option of having the back colored in some way, then I would do the plastidip method again.
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