No, it doesn't suck solution into the tube. Believe nothing else, no matter how wet or dry you knead the dirt. Each time you have to unscrew the tip, stuff it manually with a trowel, clean the threads, and then screw the tip back on. The volume of the barrel is too small, so frequent refueling is required. Luckily I bought two, which allowed me to get into a rhythm with my installer. NO LABOR SAVINGS if I had to pay two people to do it. Also, you need to clean it and leave it (and the tips) in water overnight to use it the next day. All this to say that it fills grout lines quickly, so edge grouting is kept to a minimum. As they say, "adapt and win."
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