Making A Concrete Countertop With Sink. If you dont have one you can use an alternative - for example a mixer-attachment for a rotary hammer. You need to prevent concrete from leaking water during the curing process.
Now its time to attach the knock-outs to the countertop form. For more info about the build visit. DIY CONCRETE COUNTERTOP TIP 6 Never sand melamine.
Now its time to attach the knock-outs to the countertop form.
You need to make sure the foam is as least as high as your mold. Use a router to cut the foam using a Masonite template as a guide. When you pour the concrete in the foam needs to prevent any concrete from getting into the sink. How to Make Sink and Faucet Holes in Concrete Countertops For sink and faucet knockouts use blue or pink insulation foam.