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if you can get water spray grinder
that will keep the dust down
for sure a walk behind
concret is tuff stuff and a hand grinder
will take for ever and put you tooo close to the dust
I do alot of stuff my self
but would at least get a few pro bids
on a job like this
very eazys to screw up and get a wavie mess
and it is a nasty job
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