We print on our latex all the time... It does a nice opaque black.
I wouldn't do a CMYK 4 color screenprint, or anything that requires super tight registration as the films.never perfectly align... But for stuff like traffic / 2-3 colors that can be a mm off, latex works great.
We use a film from Gans digital.... I'm pretty sure they don't carry roll vinyl anymore, but may be worth asking them about it.