What to use to refresh gnome?

I have a garden gnome that's about 3 feet tall and made out of a plastic type material. He's starting to look pretty "worn" after being out in the yard for a year, and I'd like to try to paint him to freshen the look. What kind of paint do I need to use and where do I buy it? I went to a craft store locally and they didn't seem to know much - they showed me some little bottles of "outdoor" paint, but I noticed on the bottle it said it was for porous surfaces, and I don't think he's porous (I'm thinking porous would be more like wood, right?) Help, please!
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