I needed to point out a tear in my mesh wall and tried it by hand and with a piping bag but got a big mess. First, understand that masonry is a craft and a craft, and no old homeowner can easily cope with it on their own. These guys spend a year just mixing the mortar and the key to success is getting the mix right. Second, as mentioned, tighten the nuts on the gasket. Two things: don't put it in the tube because once it's stuck and the tube is dry, it's VERY difficult to get it out! Second, make it very tight or the water will bypass the seal and your grout will dry out. This will take some experimentation, don't work with more than 5-10 pounds of grout at a time, you may have to unload the pipe and mix again. occasionally. My tears were pretty bad. The mason charged $300 to fix it. I did a great job with this tool, the cake cutter, and the $4 mortar.
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