When purchasing your bathroom sink, you want to make sure that it will properly fit your vanity. A bathroom sink should be one inch larger in terms of length and width than your vanity base. If your vanity base is 24 inches wide and 18 inches deep, you will want to purchase a bathroom sink that is 25 inches wide and 19 inches deep. The extra inch around the sides helps hide the caulk that will be applied later and offers structural support to the sink.
Using a caulk gun, apply a heavy bead of adhesive bathroom caulk one the top of your vanity, where your bathroom sink will sit. As you will want to position you new bathroom sink as evenly as possible on your bathroom vanity, using a level may help ensure that everything lines up correctly. Firmly press down around the edges of the sink to compress the sink into the caulk. You can purchase different shades and colors of caulk to match your bathroom sink. You’ll also want to apply a thin layer of caulk along the outside edge where the vanity meets the bathroom sink. The slower you go with the caulk gun, the nicer the bead you will have.
Adding side splash is something you may want to consider if either the left or right side of your bathroom sink sits against a wall. Installing a side splash will help prevent water damage from ruining your wall in the form of mold or paint damage. To install a side splash, use the same bathroom caulk you used to install your sink top but apply the caulk around the back side of the side splash and sparingly throughout the middle. You don’t need an excessive amount of caulk because you want your side splash to sit fairly flush against the wall.