Apply grout in steady diagonal passes to fully pack joints and prevent voids.

Start by mixing grout to a thick peanut butter consistency and only mix enough for thirty minutes of workable time so it does not skin over. Use a soft rubber grout float held at a forty five degree angle to push grout into joints with firm pressure, working one small area at a time so the grout remains pliable for cleanup. After filling a joint, scrape the float at a ninety degree angle across the tile surface to remove excess grout without digging product out of the joint. Wait until the grout film is matte but still slightly tacky, usually about fifteen to twenty minutes depending on temperature and humidity, then wipe with a sponge rinsed frequently and wrung until damp using light diagonal passes that mirror your float strokes. Finish by gently shaping joints with a rounded grout finishing tool or a finger wrapped in a damp cloth for a consistent profile, and allow grout to cure per manufacturer recommendations before light foot traffic.

Common mistakes include packing joints too loosely which leaves voids and weak joints, so always press grout firmly into the gap and inspect by running your fingernail across the joint; if it compresses easily you have a gap and should repack. Another frequent error is overwatering grout or using a wet sponge too soon which causes haze and weakens the joint; avoid this by keeping your sponge only damp and performing the first wipe after the film is matte and tacky. A third issue is cleaning with circular motions that pull grout from joints and create low spots, instead use diagonal wiping strokes and scrape excess at a ninety degree angle to preserve joint fullness.

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