Then you need to fix a place to begin.
How to sand cement floor.
Grinding and repairing a concrete floor can create concrete dust so be safe and wear a respirator a dust mask will not give you enough protection.
Examine the concrete floor to ensure you have removed any paints stains or other coatings.
Make sure that the sealer penetrates the floor for as long as instructed by the manufacturer before you resume the operation.
Simply mix one cup of trisodium phosphate tsp or two tablespoons of a good degreasing dish soap like dawn into four gallons of water and mix well.
Apply an even coat of concrete sealer to the floor before resuming the sanding on the wet floor using a medium coarse abrasive in the range of 80 to 120 grit.
Also like sanding a concrete floor it is best to start with an area in a corner or near a wall.
After the first pass go over the floor with a fine or superfine sandpaper disc to finish the surface.
Each sander has a different series of sanding pads that are designed for use on concrete.
Repeat sanding as necessary until the sanding is complete.
You will want to give a stained concrete surface special attention before sanding especially if grease is involved.
Sanding a concrete floor requires a variety of sanding pads.
Let the concrete floor air dry for three days.
You might find yourself wondering how a hard stone like surface can be sanded.
If your floor is concrete use a concrete grinder for large open areas or a 4 inch or 8 inch angle grinder with a cup wheel attachment made for use on concrete.
Clean the area of dust with a broom and dustpan after finishing.
Attach a piece of 80 grit sandpaper to a sanding block or electric floor sander.
Sanding concrete sounds like an impossible task.
Step 2 sand the floor by hand using the sanding block or with the electric floor sander.
Once you have everything prepared you will need to mix the mortar.
You will start with a coarser grit pad.