Abstract: A process for fabricating a seamless flush mounted countertop sink, which includes the steps of constructing a sink bowl (22) that has an outwardly extending peripheral top flange (26). The sink bowl is then captivated upside-down on a flat mold (34) and uncured filled polymer (40) is poured on the mold and flattened to a level above the flange, creating an integral countertop sink (44). The polymer is vibrated and cured. In the preferred embodiment, the top surface of the countertop is sanded smooth and, in the second embodiment, a clear gelcoat is added prior to pouring, creating a glossy finish. The third embodiment spaces the sink bowl flange within the thickness of the countertop (42) and is finished by either sanding, or a previous gelcoat is added, as above.