I did a lot of concrete work for my father's company which specialized in swimming pools. I have done a lot of sidewalks, patios and pads. I have tried to finish concrete and I'm not good at it. The hard part is being able to trowel it smooth, which takes a certain touch that I don't have. There are many other issues with concrete such as getting the mix right. Then you have to float it and let it setup before you can trowel it, wait too long and you can't do anything with it. You can hide mistakes on a sidewalk, but I think a counter would be very difficult to do and get it to look right. I haven't done any concrete work in over 20 years, but I would find an experienced finisher to do the work.
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