My son is entertaining the thought of using a wagner paint sprayer to stain hardwood flooring,I guess for him he wants speed but I told him I don't think getting that would be a very bright idea...

Stain really needs to be buffed or wiped into the wood grain. Spraying would basically just make a mess .you would have to tape off walls and floor trim to protect it from over spray.

I know,he has seen the errors of his ways..... LOL His mother hand stains,and has totally abandoned the idea of using a wagner.....