A method and applicator for adhesively affixing an ostomy adapter to the skin of a user. Under ordinary circumstances an ostomy adapter includes an adhesively treated skin barrier on its underside which is affixed by uneven manual pressure, leading to adhesive seals that can leak, are unsanitary and uncomfortable. An applicator formed as two concentric annular cylinders, with a smaller diameter inner cylinder moving linearly within the larger outer cylinder, is able to apply a uniform pressure simultaneously along the adhesive seal between a skin barrier and the skin itself. The inner cylinder engages a hole in the skin barrier and both cylinders create a uniform downward pressure.
