Getting cold galvanizing rattle-can paint to stick to a propellor seems a bit of a stretch. I use the same anti-fouling paint on my bronze prop that I use on the fibreglass hull, but it never lasts long on the prop. A couple of months at best. The same paint on the hull lasts 2 years. It's an ablative paint and simply wears off the prop as it spins.
I suppose if your boat just sits in a marina or at anchor, it'd work for a while, but if you spend much time underway the zinc paint would soon deteriorate, either from ablation due to friction with the water, or else sacrifice itself as part of your anodic protection. In 20 years of salt water sailing I've never heard of anyone using zinc-based rattle can paint on a prop. But there's always a first time. There is a fairly expensive product and process using copper-based paint for bronze props that some have reported to me as worth the cost. ymmv.
I suppose that if you got your prop super clean, and then used an appropriate epoxy primer, and then applied the galvanizing paint while the epoxy was still tacky (and then not spin the prop too fast), it might work for a season. If anyone has done this on a cruising sailboat, please report back. Inquiring minds want to know. Meanwhile, it might be comforting to know that other opinions are available here: http://yachtpals.com/prop-barnacles-9167