Mini-Pond Minutiae

So, I bought this water feature reservoir as a raised mini wildlife pond and am intending to gussy it up to fit in with the vintage theme of my garden. I'm going to give it a distressed look using Rust oleum Universal brush paint. I'm not going to paint the inside for obvious reasons but would like to paint the lip. For my own peace of mind, I'd be happier if there was a barrier between the painted bit and the inside. Could anyone recommend a waterproof tape I could use for that purpose?
Also, does anyone here with a raised mini pond have any precautions in place for overflowing in heavy rain or do you just leave it to its own devices?
Also, does anyone here with a raised mini pond have any precautions in place for overflowing in heavy rain or do you just leave it to its own devices?
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Essex is a tad on the dry side. When I moved to Leicester, my water bill was half of what I was paying in Colchester! The rain has its moments here but I'm probably overthinking it 😄