Blue Rhino 1 bag/1 kg. can use about 4 m2/ gap tile 2 – 4 mm., Before start should clean floor to dry and without dirty in gap tip. Scoop some grout onto the tile floor with a trowel. Spread the grout over a small gap. And then remove excess grout with damp sponge before completely dry, Afterwards 2 hrs. clean floor again.