Mercury - Service Decal Kit Propane Outboard Series Marine Adhesive Backing 8M0154342. Overview. Anyone who's owned a small outboard knows how personal these engines become. They're the ones you trust on quiet sunrise runs, on dinghy trips to shore, or when you're easing down a winding creek with nothing but the sound of water under the hull. When the decals start to fade or peel, it doesn't just age the engine-it takes away a little of the pride you feel every time you fire it up. The Mercury M