Our house has several sliding windows that have a strip of rubber weatherstripping where the movable part of the window meets the frame when closed. The most recent paint (a semi-gloss latex) is over two years old, and it still sticks like it was painted yesterday. I've tried Amour All, which seemed to help briefly, but I'd like to find something that might last an entire season, hopefully without a buildup of gunk.
The window slides on an aluminum rail, and works reasonably well once there is the slightest gap.
Clarification: The window slides without problem, except that the vinyl weatherstip sticks to the paint (so much that it sometimes pulls some of the weatherstrip out of its groove, and some paint is now on the vinyl instead of the frame).