Concrete must be wet to use

They work okay. I used these at work to mark out some concrete repairs. After using it to write a little the felt tip would become dirty and worn. I had to use water to clean it off and after another 10-15 marks it would be unusable unless the concrete was wet already. Honestly just get some chalk and wash your hands when you are done, these things are to inconsistent to be seen as a viable replacement for chalk.

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