Zombie blood wouldn't be likely to repel other zombies, but it could serve to mask your odor, causing the other zombies to pass you by as they look for their next meal. This is the case in both The Walking Dead television program and graphic novel. In the first season, Rick and Glenn famously covered themselves in all sorts of zombie viscera to walk undetected among the zombies. Michonne's "pets," the armless and jawless zombies she kept with her, also served to camouflage her. Hiding in plain sight, she was able to move through the zombie wastelands. That being said, zombie blood itself would be full of infectious pathogens and would need to be handled with extreme caution. It would be about the most toxic waste you could possible imagine. Because everyone in The Walking Dead is already infected, it doesn't matter to them, but I wouldn't take chances.