Pepper spray notes here: they usually come in a few types. There’s stream, fog, and gel. Gel can be pulled off and flung back at you, fog just hangs in the air and you’ll probably breathe it in, so I suggest a stream. Also there’s water based and oil based. Oil based is much harder to get off. There’s also peppermace, which combines both (though some people have a tolerance to mace and it may be considered a chemical weapon in your area).

Tl;dr oil-based stream pepper spray is the way to go. Practice with it.