Floor sanding is not really a DIY job. It is in fact a job for the professionals. Anyway just in case you want to know how to sand a wooden floor I will give you a a little guide to sanding and restoring wooden flooring.
First of all you will need to use a belt floor sanding machine with a very coarse 36 grit on to remove all of the old seal and to level the floor. Always sand the floor going with the wood grain or at a 45 degrees angle to the grain.
Next you will need to start the smoothing process by using a 50 grit sanding belt. This will remove the scratches left by the previous 36 grit belt.
Next use a 80 grit sanding belt to remove the scratches left by the 50 grit sanding belt.
Next you will need a rotary sander or a buffer with a 100 grit or 120 grit disk to remove the fine scratches left by the 80 grit sanding belt. The buffer will leave the floor very smooth and prepare the floor for priming.
You will then need to apply a wood flooring base prime to prepare the wood floor for lacquering.
After you have primed the wooden floor you will then need to run the buffer machine over it with a 150 grit disk to remove any raised grain, leaving the floor very smooth.
Hoover the floor to remove all traces of dust and begin to roller on the lacquer of your choice e.g Bona or Junkers.
Next apply the second coat of lacquer after the first coat is dry.
You can then apply a third coat of lacquer if it is a high traffic area to protect the floor more.
You should then try your best to keep the floor free from any grit and dirt to keep the floor looking at its best for a longer period of time.
Floor sanding and restoring wooden flooring can transform a whole room from looking dull and dirty to looking new, fresh and very trendy. Wooden flooring is a very expensive material for flooring when you include the product and the installation cost, so it is therefore very beneficial to sand the floor and restore it as the cost is kept very low. Floor sanding again is a professional job so if you can help it do not try and start a floor on your own as it may end up ruining your beautiful wooden floor.
For more floor sanding info there are many YouTube videos on this subject.