Ideas on how to paint old school medal lockers
Best bet for painting metal is to spray it. Several light coats are best rather than trying to cover in one coat which will cause drip marks. PS: Stand alone paint stores such as Sherwin-Williams used to do custom colors in spray cans if you purchased a full case. Not sure if they still do that.
First clean them well. then sand lightly, then paint.
Ditto from Pamela, but use Rustoleum primer and spray paint
Make sure you use a paint for metal, Rustoleum comes in many colors and textures, even metallics. Follow the directions for timing between coats.
If you want them to look good beyond 1 or 2 years, powder coat.