Gather grout, grout float, bucket, sponge, clean water, microfiber cloth, and grout sealer
Let the tile adhesive cure fully before grouting
Remove tile spacers and clear debris from the joints
Mix grout according to the manufacturer’s instructions
Let the grout slake if required, then remix
Load grout onto the float
Hold the float at a 45-degree angle
Press grout firmly into the joints, working diagonally across the tiles
Fill all joints completely
Scrape excess grout off the tile surface with the float
Allow grout to set until it firms up slightly
Wipe the tile surface with a damp sponge in light passes
Rinse the sponge often and change water as needed
Smooth and shape the grout lines with the sponge or a grout tool
Remove remaining haze with a clean microfiber cloth after the grout firms up
Let the grout cure for the recommended time
Apply grout sealer if the grout type requires it
Avoid getting the backsplash wet until fully cured