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Simply so, can you put new grout on top of old grout?

While it's possible to apply new grout over existing grout, the results are usually less than satisfactory. Since the layer of new grout would be very thin and vary in thickness, it may not adhere well and the old grout could show through. Removing grout from a tile floor is not nearly as difficult as it used to be.

Additionally, what to do if tile grout is cracking? Repair the Grout

1. Clean the broken grout area with a 1-to-1 vinegar and water mixture.
2. Use a grout saw to remove the loose or damaged grout.
3. Dampen the tile with water and use a paper towel to absorb any that puddles in the joints.
4. Hold the grout float at an angle and spread the grout, filling the joints completely.

Thereof, do you have to remove all grout to Regrout?

The good news is that you don't have to remove the existing ceramic tile. The bad news is that you can't regrout over the top of the existing grout. The old grout must be removed by hand or by using a small electric grinder. If not, you may have to use a fine-tipped screwdriver and a hammer to remove the grout.

How much grout do I need to remove before Regrouting?

You only need to remove the grout from the beveled edges of the tile, on 1/16" grout widths your pointed tips will rest on the edges of the tiles and by holding the tool at a 30 degree angle you will remove enough grout to enable you to see new surface of the old grout..