Shot blasting is a surface preparation method that propels small steel balls, called shot, at a concrete floor at high speed to remove coatings and contamination while creating a rough profile. The machine reclaims and recycles the shot as it works.
How Shot Blasting Works
A self-contained blast wheel fires the steel shot straight down onto the concrete, and a vacuum system immediately pulls the used shot, dust, and debris back into the machine, where the shot is screened and reused while the dust is collected separately. This makes shot blasting one of the cleaner surface prep options for large open floors like warehouses and retail spaces.
Shot Blasting vs. Diamond Grinding
Shot blasting tends to produce a more aggressive, uniform, textured profile across large flat areas quickly, while diamond grinding gives more control for edges, corners, and smoothing work. Many commercial jobs use shot blasting as the primary prep method for the open floor area and finish with diamond grinding or hand tools along walls and tight spaces the blast machine cannot reach.
Practical Tips for Shot Blasting
Adjust the shot size and blast speed to match the coating system’s required profile depth, since a heavier build coating usually needs a rougher profile than a thin sealer. Make several passes in overlapping rows rather than one heavy pass to keep the profile even. Check reclaimed shot regularly and replace it once it wears down, since worn shot loses its cutting effectiveness and slows the job down.
