Recommendations for fabric paint & vinyl paint

Pet
by Pet
I want to stencil a shower curtain. Looking for recommendations on the best paint to use on fabric, that does not get hard and allows fabric to flow. I prefer a spray paint. Is there such a thing?
My second project is to spray paint vertical blinds but have read that the strings will get stiff and not work properly. Has anyone found a vinyl spray paint that doesn't ruin the strings?