Well, the first think I'd check is the pipes -- if they are busted or leaking, you may need to withdraw and reconsider. Second, I'd check the shell and see if there are major and obvious leaks below the normal operating level -- if the pool was holding water at that level, you're probably good to go. But, if not, there are likely leaks at the level of the water, unless it's been dry there lately.
Once you've gotten that far, I'd look at Gunzite / Zeron from Kelley Tech. There's an recent Ultraguard thread here already; you might want to look at it. Search using the like to local Google search from the box in the upper right of most PoolForum pages. Keep in mind that weather conditions are a HUGE issue when painting outdoors. That's a big difference from your experience.
Ben / Poolforum
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