I doubt your going to find many fans on trying to do this job.
That would be a huge messy job, and may not even come out right after all that work.
Trying to hold up a heavy grinder all day and hold it flat will be a big undertaking.
And by painting the brick you have taken a next to 0 maintaince wall and made it into high maintaince one.
I know I'd pass on the job no matter how much I needed the money.
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