

I always paint the back of my tanks. The best paint I've ever used is just a basic exterior weatherproof paint. Most of these exterior paints have a % of latex in them to prevent cracking.
The very best thing about them is that if you choose to change your mind at some point in the future they just peel off, in one big thin flexible sheet.
I was breaking down the 180g tank in the picture and moving it on to another hobbyist. So I peeled the back off so they could do what they wanted with it. No scrapers or heat guns needed. Just pick at the corner and peel.
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