Grouting the tiles
Mix the grout according to the manufacturer’s instructions; make up only a small amount at a time and, as with adhesive, work in areas of 1 sq metre (11 sq ft). Apply it with the straight edge of a rubber float, or a sponge or squeegee, making sure the joints are properly filled.
Pack the grout firmly into the joints and smooth off using a small rounded stick-don’t try using a finger as the grout is likely to irritate your skin. It’s best to remove excess grout (and adhesive) as soon as possible. If it sets it will be difficult to remove.