Don't have an intex pool, but we did paint a white vinyl fence.
There was a problem with the fence poles. The company came out to look at the damage. No warranty because of the paint!!!! (After a lot of whining , complaining, e-mailing and constant questions, they did give us 50% cash back. Just to get rid of us!!!)
We used primer + paint. When the sun is hot, something is leaning against the fence, the paint adheres to the other object & peels off.