The manufacturer's instructions should be strictly adhered to when preparing the grout.
The grout should be packed into the cracks between the tiles using a rubber grout float. Grout should be worked in a circular motion while holding the float at a 45-degree angle to the tiles. This is the only way to ensure that the grout fills every nook and cranny.
Moisten a sponge with water and use it to clean the tile's surface and remove any excess grout. Rinse and clean the sponge on a regular basis to prevent it from becoming clogged with grout.
The grout has to dry for at least twenty to thirty minutes.
Once the grout has dried, you can remove any excess by polishing the tile with a dry, clean cloth.
Apply a sealant to the grout once it has dried completely to make it stain-proof and easy to maintain. As soon as is practical, this needs to be completed (typically after 24 hours). The best outcomes can be achieved by always adhering to the manufacturer's guidelines.