you need to be more specific? is the paint peeling? is it oxidized? is it faded? Anyway if the paint is just faded or a little out of shape, get it compounded or buffed it will make a world a...
Fixing tacky paint is almost impossible. Honestly, your best choice, unless it's tiny, is to redo it. You may need to sand it down, use primer, or simply paint it over to fix it.
This website has a...