It is important to clean concrete thoroughly beforehand as any particles or residue will interfere and may scratch the floor.
How to use a concrete floor sander.
Floor sanders work on concrete the same way they work on wood so a heavy duty sander will be suitable for more uneven surfaces whilst orbital sanders will finely sand already smooth concrete.
If you use a wet dry sandpaper you can wet the area before you work to keep dust down.
Each sander has a different series of sanding pads that are designed for use on concrete.
You will start with a coarser grit pad.
Do not let the slurry dry on the concrete because it will harden in place.
You can use either a floor sander pole sander or a grinder depending on various factors like the size of the floor to be polished availability of time budget and the skill of the operator.
Top tips for using a floor sander use a floor sander effectively in order to complete your hardwood refinishing project more quickly and easily.
Thus when working on an indoor floor or large surface sand the entire surface regardless of how much actually needs worked on.
If you only have a small area to sand you can also use a palm sander orbital sander or belt sander.
Note that you cannot sand one spot without risking discoloration.
Working on a concrete floor or other large surface will require either a floor sander or a large degree of masochism.
How many and what types of pads depend on the sander that you choose and the type of finish you are hoping to achieve.