I used ceramic tile for my bathroom, it looked good but i as was cleaning the grout off there was a few spots where the grout did not bond.
After shaking powder grout before mixing I reapplied the grout in the area where the grout broke up and came out. I let grout dry 36hrs and started to clean the grout off the tile again and noticed the grout between the cracks was coming off again. I can't seem to get the grout to bond in the cracks between the tile in these three areas. What am I supposed to do?