Previously re-grouted a shower tray with a poorly grouted hex tile 2 times. 4 of them used. One broke in less than 10 minutes, the other 3 lasted over an hour from constant grinding. My only advice is to run your dremel at half speed when the bit is fresh and sharp. As the drill becomes dull, gradually increase the speed. Also tried a number of diamond and titanium coated bits in multipacks. The grout is strong and melts in 5-6 minutes at a time on medium speed.
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