Hi guys, I have these metal door frames that I want to paint it black. Is it ok to use spray paint (canisters) instead of normal steel paint (using brush)?

I wanted to paint it matte black, hence thinking of using spray can (as I don't have those compressor machine)

The existing paint is new (with minor scratches here & there), and do I need to sand it before painting?

the frame is similar like this (original beige color, intend to paint matte black)


Need sifus advices