Mercury - Mariner Decal Set Cowling Graphics OEM Marine Finish 8M0148621. Overview. Anyone who runs a Mercury Mariner outboard knows the pride that comes with seeing that clean, sharp cowling shining in the sun. It's more than just a motor on the transom-it's part of your time on the water, part of the memories you make every season. Over time, decals fade, peel, or take a beating from trailering and long days in the salt and sun. That's when a fresh set can make your engine feel new again. The