I am building my own counter tops from concrete, I have the floors reinforced so you don't have to warn me etc, etc. My problem is after I remove the sides of my form ' the size is 7 x 5 by two inches thick' so it can not be precast, the top edge will be crisp, any suggestions on how to smooth it out, a sidewalk finishing trowel with the round over effect will not work as that will an edge on the sides after complete. So, outside of trying to accomplish this while wet, and not feeling good about trying to do it free hand with a grinder as I feel this will leave a rough uneven edge, anyone have any suggestions on how to round over the crisp edge that will be left removing the form? The sides are easy, I know to vibrate the form etc, just researching the options for smoothing the top/side transition. I have poured three small practice pieces and even tried my router while the concrete was green, but that was a big fail : . I might try sandpaper and a belt sander, but an angle grinder and free hand has too much risk of a screwup. Got any ideas for me?