1. Use a paper knife to remove the dirt in the gap between the tiles and leave a 1mm groove; 2. Use a brush to remove the debris in the gap between the tiles; 3. Use an awl to pierce the bottle mouth of the tile grout; 4. Install the plastic head, and use a blade to cut the plastic head into a 45-degree bevel; 5. Install the tile grout on the glass glue gun and spread it evenly in the clean groove; 6. After about 60cm, immediately use your fingers or a scraper to spread the paint evenly; 7. Use a sponge to wipe off the excess paint on the tile, so as not to be difficult to clean after solidification, after wiping several times, the sponge can be washed for reuse.After the tiles are caulked, the surface should be flat, clean, free from oil, dry powder and other impurities. It is necessary to wait for the cement to completely solidify and dry before applying the tile grout; This tile grout is suitable for the gap width within 1-5mm and the gap depth of about 0.5-1.5mm. The construction thickness of the tile grout is about 0.5mm. Too thick is not only wasteful but also takes a long time to cure.