The Laser Grinder® was first invented in the early 1990's and was considered the world's most technologically advanced floor grinding machine. Grinding concrete and dust issues | The Floor Pro . Feb 12, 2011· I may need to do some grinding on a concrete floor to take down a couple of high spots.
Both the plaster and filler may sag if applied to a deep chase, so they may need to be built up in layers. The chase needs to be filled from the back and around the conduit/pipe to the front – a small trowel will help push the filler into the back corners and behind the conduit/pipe – use the trowel across the sides of the wall surface to cut off the filler to the line of the wall.