This episode of Adhesion Matters examines the indispensable and evolving role of advanced adhesive technologies in the watchmaking industry. Historically, watchmaking relied on mechanical fastening and natural glues like shellac. However, driven by demands for thinner profiles, lighter materials, enhanced water resistance, and integrated electronics (especially in smartwatches), the industry has significantly transitioned to synthetic adhesives. These modern chemical compounds offer superior sealing, the ability to bond dissimilar materials, even stress distribution, and design flexibility that mechanical fasteners cannot match. Key adhesive chemistries employed include epoxies (for structural bonding and jewel setting), silicones (for case sealing, electronics protection, and vibration damping), polyurethanes (for structural and waterproof sealing), cyanoacrylates (for rapid assembly), and UV-curable adhesives (for precise crystal bonding). Specialized products like threadlockers, dial adhesives, and surface modification coatings further enhance performance. While offering significant advantages in design, performance, and manufacturing efficiency, adhesive bonding presents challenges, particularly regarding meticulous surface preparation, controlled curing, long-term durability under environmental stress, and the critical issue of repairability and recyclability due to the permanent nature of many modern bonds. This tension between performance and sustainability will shape future adhesive innovations in horology.