Helpful Hints

Frequently asked questions and helping tips for using the U-Sand Hardwood Floor Sanding Equipment

Why should I use the U-Sand hardwood floor Sander?

The U-Sand hardwood floor sander uses patented, random-orbit technology, which enables anyone to sand their floor to professional results.  No other sander combines sander, edger, and buffer, giving use of all three pieces of equipment in one.

How do I start this project?

Clear all contents and remove anything covering the  wood flooring.  Carpet and tack strips should all be removed.  Nails should be counter-sunk or pulled.

What grit sandpaper should I begin the sanding process?

Starting grit is dependent on floor finish.  Floors with heavy finish or heavy damage will start with 24 grit.  Other floors with start with either 36 or 40 grit.  Floors with polyurethane finishes and very minimal scratches may start at higher grits.  Always begin with the most appropriate, highest grit.

What grit sandpaper should i end the sanding process?

Typically, a plain(un stained)  polyurethane-coated floor can be finished after 80 grit.  Staining and other finishes may require a higher grit of up to 120 grit.

How much paper will I need with each grit?

The opening grit will have the widest amount of variance based on finish or in the case of raw wood, quality of milling.  Typically, we expect 50-75 square feet per set of four pads on the opening grit.  On subsequent grits, we expect approximately 100 square feet.  These are general guidelines and may vary depending on the floor.  We suggest changing sandpaper discs every 15 minutes for beginner users.

How much does the U-Sand floor sander weigh?

The U-Sand Pro (black and silver) weights 100 lbs.  The original U-Sand (gold and tan) weighs 125 lbs.

Can I use it without the vacuum bag?

Yes, the sander can be hooked to an external vacuum.  Please check with the vacuum manufacturer recommendations.

How long will it take to sand my floor?

This is difficult to estimate, as it depends on the quality and condition of the floor.  However, the average flooring job, from the first sanding grit to the first coat of polyurethane, can take approximately 8 hours to complete 250-350 square feet.

What can cause/eliminate swirl marks?

A random-orbit sander naturally leaves what many people call “swirl marks”.  In sanding, we move up gradually in grits to remove these marks.  Skipping grits will often leave marks behind that are hard to see with the naked eye.  Try a test area in an inconspicuous space before proceeding to sanding the entire floor.  Thoroughly vacuuming the floor between use of different grits of paper will also help to reduce them.

Can the U-Sand be used to scuff between coats of polyurethane?

Yes, this process should be completed utilizing special pads, such as U-Sand  buff pads (U-600K).  Be sure to empty the dust bag often in a fire retardant location and never leave any material/dust in the bag when not in use.

Can the U-Sand be used for decks?

Yes, the deck should be in good condition with no exposed nails or screw heads.  There should be no large over wood (this is the height difference in boards).  The U-Sand is designed to sand flat surfaces and will be unable to move to the next board if it is more than 1/16″ higher.  Ignoring this advice will cause damage to the backer pads.

How long until I can return my room to average activity after sanding and finishing?  

This will be dependent on the finish you use.  Please read the label on your finish.

What to do if the machine is not working properly?

It can be used effectively as a boat anchor.  Just kidding!  Please return it to your rental center.