Use SOPRODUR HF 8 as a flexible grout between the tiles. Try to make gaps the same size on every side, use plastic spacers. We suggest 1-2 mm gaps.
Mix grout to the consistency of a thick paste, and apply it by forcing the grout between tiles with an applicator gun.
Hold the float almost perpendicular to the floor. Wipe away excess grout from the surface of the tiles. Take care to pack all joints. Use a small brush to shape the grout.
After 20 minutes, wipe away all excess grout with a damp sponge. Keep your sponge clean by rinsing it often. Follow the grout manufacturer’s instructions for curing and cleaning the grout.
After the grout has cured for a week, apply silicone grout sealer with a small paintbrush to help prevent grout discoloration.