I'm pretty much doing the same as you. Using my garage. Before I paint I sweep then blow off the floor. I used to wet the floor down but have had the air hose splash paint in my clear a couple times, so I don't do that anymore. I have a window in my garage, so I stick a window fan unit with a furnace filter in on it to suck some of the overspray cloud out, then I stick a 24" box fan under the rollup door, also with a furnace filter on it, then tape plastic sheeting on either side to seal off the outside. I still get some dust in the clear, but nothing that I haven't been able to wetsand and buff out. I really need something to move more air through the garage though. It gets really cloudy in there, especially when shooting clear on a car. Doing the bike stuff is not bad at all though.