Mercury - Bellows Adhesive MerCruiser Sterndrive Series Oil- and Fuel-Resistant Marine Bonding Formula 86166Q1. OverviewAnyone who's owned a sterndrive long enough knows the small things matter just as much as the big ones. A solid seal on your bellows isn't glamorous, but it's the kind of protection that keeps water where it belongs-and keeps your boat running season after season without surprises. When you use Mercury Marine part number 86166Q1 Bellows Adhesive, you're choosing the kind of rel