It's hard to beat a sprayed finish for quickness and quality. The problem is that you need a place to spray where ventilation is not an issue and overspray from your project won't land on walls, furniture, or cars. This shopmade spray booth is just the ticket. Modeled after a commercial cross-flow model, it's affordable and convenient, and it will fit in the back of a garage or in your shop, providing storage space when it's not being used. A high capacity fan at the back of the booth expels waste air through a door in the end of the building. Fresh air enters the front, picks up overspray, and deposits it on a filter before passing through the fan.

From Fine Woodworking #230