I've never even seen Vallejo rattle can primer, so I can't speak to its efficacy. But generally speaking, it's a can of black spray paint. What would you do with a can of spray paint, if not prime models? For a lot of us, maybe nothing
You can also ask your store what its return policy is.
I would be shocked if any black primer were so horrible as to be unusable, though. Ive tried a lot of brands and never came across that. It's not like varnish, where some are just garbage.