Using steel tools like that guy is using on the pole, can cause the concrete surface to lose its air which might affect the surface over time. It might flake away, it might not. You're just not supposed to use steel on air entrained concrete. Magnesium tools are what you should use.
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But living an honest life - for that you need the truth. That's the other thing I learned that day, that the truth, however shocking or uncomfortable, leads to liberation and dignity. -Ricky Gervais
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