The drawbacks of concrete countertops:
Not many concrete contractors know how do them right , and someone who pours concrete outside for a living is for from an expert on concrete countertops. Concrete countertops are molded, polished, installed. It may seem easy, but it takes a tremendous amount of skilled labor,and patience, to do these things correctly. On my site I offer a couple of free pdf.s on ideas for the concrete countertops, sinks, bathroom accents.http://makingconcretecountertops.blogspot.com
Benefits and Products:
My favorite concrete countertops to make our with recycled glass. You can get really creative here with your colors, and they just look really cool.
Make sure your forms are made with a template, and are very strong. You will have a better chance of getting it right the first time this way, and use rebar, along with wire mesh or lath for reinforcing.
When pouring and curing, make sure the form is above ground on a level flat surface. If its cold, place a space heater underneath the forms. Let it cure for a couple of days.
Polish it off with a wet grinder, starting with a diamond cup, going up to about 400 grit diamond abrasive pads.
If you did not add color in the mix, now you can stain the countertop. I use water based stains most of the time because there are more color choices, and mixing colors is easy. Just make sure the concrete will accept the stain by placing some water on it. If it absorbs fast, your in. If not, try opening it up with a light muriatic acid wash, then neutralize it with water and baking soda.
I always seal the countertops with a few coats of water based penetrating sealer, then a couple of coats of natural "buffed on" waxes. Gives it a real shine.
Though its not expensive to make, messing up in any of these steps could set you back the money to do it again, and valuable time. Its always frustrating doing something twice.