Can you use thinner grout

Yes, thinner grout can be used, but it depends on the type of tile and the spacing of the joints. For narrow grout lines, such as those found in mosaics or small tiles, a thinner grout is often appropriate. However, it's essential to ensure that the grout is suitable for the specific application and to follow the manufacturer's recommendations for mixing and application to avoid issues like cracking or insufficient adhesion.