A win nozzle will give you a reasonable feel for wet blasting. I have a Farrow wet (slurry) blasting system which is a major leap up from a win but IMO you need to learn what your existing equipment is capable of first, then try the win and if you see lots of demand for a full blown slurry blaster then go for it. The Problast would benefit greatly from a media valve upgrade, put some money in that if you want the thing to work really well.