Many years ago I worked for a guy who was determined to jazz up a dropped ceiling by painting a select few tiles bright colors.We did it with latex semi-gloss, but in hind sight, flat or eggshell would have been a better choice.
If you're looking to "recoat" stained tiles there are ceiling tile spray paints available or stain kill will work.
It probably wouldn't be practical to try to roll or brush the tiles while they're in place.
Rolling or brushing paint on dropped-ceiling tiles generally will not get the paint into the creavices and holes, and the old color will show through those holes.
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