To polish the concrete countertop to a smooth finish use an abrasive pad and a water feed to smooth the sides and concave sinks.
How to make a concrete countertop with integrated sink.
Using a sink mold sold here you can place the mold as part of your form work and pour the sink as part of the countertop this is a great option for overall strength of the concrete.
Make the sink mold concrete artist buddy rhodes uses fabric resin and body filler to build a mold for a stylish concrete vanity basin.
I had to make it my own with the sink and adding lights.
For the large flat surfaces use a disc sander fitted with diamond discs of varying grit.
I finally decided to make a concrete countertop after seeing other instructables on the subject.
We were remodeling our bathroom and i wanted a unique option for the countertop and sink.