This is a decent tool at a good price and I have used it to caulk the corners of kitchen tiles. As there is no instruction manual it was difficult to find the right tool at first, but gradually I got better and figured out which tool to use. Using 90 degrees created more clutter so I used SRD for the corners and slowly I got better. I've also used it to remove excess grout from the top and bottom, but I think the quality could be better, rubbing against the tile causes scuff marks on the corners.
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