It is somewhat painstaking.
There is a grout removal tool available at most big box hardware stores. It is basically a handsaw that uses hardened aggregate applied to the blade instead of teeth.
You have to shave each joint down to a level below the surface that a new grout can be applied to and adhere (about 1/8" for non-sanded grout and 1/4" for sanded grout).
If you are changing grout colors, you will want to use an acid (muriatic acid) to wash down the joint edges to remove any small amounts of the old grout at the surface edge that remain, prior to new grout installation.
Because you are not installing the new grout to the full tile depth, it is advisable to use a latex additive to prevent cracking.
Sealing grout on a tile floor is very important as it helps to protect the grout from stains, water damage, and mold growth. The benefits of sealing grout include easier cleaning, increased durability, and a longer lifespan for the tile floor.
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You pull out the old grout and re- grout the whole thing. If you do patches it never looks good.
You risk having the loose tile cause the grout to chip out. Find a way to secure the tile first.
Yes, you can use unsanded grout for floor tile but you'd only want to use it if the grout lines were 1/8" wide or less - like for granite or marble tiles.If using those, be sure you have a pefectly flat surface.ANSWER:You never want to use sanded grout with marble. If the marble has to be restored or re-polished for any reason the sand in the grout with act like sandpaper on the stone.
To replace floor tile, you will need to remove the old tile, prepare the surface, apply adhesive, lay the new tile, and grout the joints. Make sure to measure and cut the tiles accurately and allow time for the adhesive and grout to dry before using the floor.
To replace a floor tile, first remove the grout around the tile using a grout saw. Then, gently pry up the tile using a chisel and hammer. Clean the area and apply adhesive to the back of the new tile before placing it in the empty spot. Press down firmly and allow it to dry before reapplying grout.
To re-grout you mosaic tables, simply use tile grout. Be sure to remove the excess grout from the mosaic tiles to preserve the tables beautiful look.
Yes, you can change the color of the grout. There are products that you can use to try to die the grout or you can just have your tile re-grouted.
Sadly, if you are looking to fix the tile with the grout, there is none. If you are looking for something that will not crack because of movement, a high end epoxy grout.