Paint over plaster.

I think I remember someone saying you only get a year or two from paint, so it's not really worth it. But I could have remembered incorrectly. I'm sure someone with more knowledge will be along shortly to help.
 
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That's right, we do not recommend painting a pool. It only lasts 2 or 3 years, it is a lot of work and it makes replaster ingredients more difficult. It is leaking? If it isn't leaking then just wait until you can replaster.
 
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