Assuming you don't have any wax on the floor (Urethane won't stick to wax) The wonder machine you should check out is called a square buffer. Home Depots that have a full rentla store in them offer screens for their square buffers which would be ideal for the light sanding you are talking about. See : http://hardwood-floor-sanders.com/orbitalsanders_details.asp?EquipID=obs18dc for a picture. Square buffers ( sometimes called Orbital Sanders) are essentially 130 pound palm sanders with wheels, a handle and a vacumm system to vacuum up the dust as you sand. Because you are spreading the weight of the machine out over and area 18" by 12" there is not a lot of pounds per square inch on the 120 grit screens. Always use a white pad with this machine. It works kinda like a shock absorber and allow the screen to flex with the floor if your floor isn't totally flat. These machines are finishing machines. They take forever to take finish totally off but are ideal for your application. Franklyn
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