The Rustoleum pro grade spray bombs are probably the best thing you can get in a can. Very tough, but it takes days for that stuff to cure vs hours for other paints.

Epoxy primer like PPG DP is a good base to start with and you can paint any spray paint over it.

If you do use paint pour primer + paint into the seams and swish it around. Where the center and hoop meet is where the rust will start first.