You need a float brush and grout. You want to make sure you have the right kind of grout. For example, you might want a sanded grout for larger grout spaces. Apply the grout with the float at a 45 degree angle, wiping as much off as you go. After it sets, use a sponge to wipe the haze from the tiles.
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You risk having the loose tile cause the grout to chip out. Find a way to secure the tile first.
To tile a bathroom, you must first find the center of the floor or wall. This is where you will lay your first tile. You work out from there. This way you have the cuts where they are less noticeable. Use a trowel to place tile glue on the tiles, put them in place. Use spacers to keep them apart at an equal distance. Use a tile cutter to cut tiles in areas where a whole tile is not needed. Once you are done, remove the spacers and use a trowel to grout between the tiles. Wipe away excess grout with a wet sponge.
It's no different on drywall than it is on any other surface. You spread the cement the same way, you apply the tile the same way.
You are going to have a seam one way or another. But the bigger the slab of marble, the fewer seams. And you can use an epoxy to fill the gaps, but it will still look like a seam. And without the grout, you can have some serious expansion problems.
yes you can, but that doesn't mean that it's the best solution. the best way is to remove the old tile. period.