Tile should be cleaned as soon as possible after grouting, but it is best to wait a few days before using the tile.

Sponging after grouting should be done as soon as possible to minimize the potential for staining.

If you wait too long to wipe grout, the dirt and bacteria will have a chance to bond and form a film. This film will make it difficult for water to reach and clean the grout, which can lead to mold and other problems.

Grout will shrink when drying, but it should not cause any problems.

There is no definitive answer to this question as it depends on the type of grout you are using and the type of tile. Some people recommend applying a second layer of grout if the first layer does not adhere well to the tile or if there is noticeable peeling or cracking.

Normally, grout should be sealed and left to dry for 24 hours before being touched up. However, in some cases it may be necessary to touch up grout immediately following a spill. If the grout has dried out too much, abrasive materials such as steel wool can be used to roughen up the surface and then a new sealant can be applied.

No, you do not need to seal grout. Grout is a porous material and will absorb moisture and bacteria from the surrounding area. By sealing the grout, you are only adding to the problem.

There is no definitive answer to this question as it depends on the specific grout and pinhole situation. However, generally speaking, pinholes in grout can lead to water infiltration and eventual mold growth. If you notice any signs of water infiltration or mold growth, it may be best to have your grout replaced.

Yes, you can grout over grout. However, it is important to make sure the grouting material is compatible with the existing grout.

Yes, grout can be added to top of grout. However, it is important to make sure that the grout adhesives are compatible and that the grouting surface is smooth.

Grout should be level when it is applied to the surface. If the grout is too low, water may accumulate and cause mold or mildew. If the grout is too high, water may escape and cause rot or decay.

No, silicone does not adhere to grout and will just slide off.