How do you prepare well painted trim boards?

Chris asked 4 years ago

I live in a relatively new house (10 years old) and I am wanting to re-paint the exterior windows. Paint is only starting to peel in small sections at the bottom of the trims. I was just wondering as the paint is pretty good in the other areas is it necessary for me to remove all the paint or just the areas which are peeling?

So basically my question is how do you prepare a well painted surface? Do I sand it until smooth then paint over or is there some other way?

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