The existing grout will be removed completely using a tile cutting machine.
Removing excess mortars and other dust and loose particles with a damp sponge. Fixing transparent tapes on the sides of tiles where joints are to be filled.
Mix Base resin and filler in the required quantity to get a uniform consistency.
Filling the joints with TEC® TILE 21 with a float and remove excess grout before it hardens by holding the float across the joints.