I've made a countertop in concrete and need to sand the underside a bit where I'm going to glue the sink and also the outer edge a little. I'm wondering which method I should use? I was considering an orbital sander but it seems hard to find sandpaper for concrete and I've been advised about using a flex sander but it seems so difficult to use. But I'm considering a file to smooth it out and then sanding by hand? Has anyone done something similar or have any suggestions
Concrete countertop in a kitchen under construction, showing empty cabinet space below and white upper cabinets above.
 
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