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Despite extensive efforts to enhance adhesion strength, strong initial adhesion does not ensure long\u2010term adhesion stability. Achieving durable underwater adhesion of hydrogels remains fundamentally challenging due to interfacial hydration and continuous water\u2010induced network degradation, particularly in complex aqueous environments such as seawater. To overcome these limitations, a hydrogel coating that achieves persistent underwater adhesion in natural seawater for over 900 days is developed. Strong initial adhesion is established across diverse substrates through synergistic interfacial interactions, while network integrity is maintained during prolonged immersion through multiple cooperative intermolecular interactions and continuous quinone\u2010mediated oxidative crosslinking. Consequently, the hydrogel exhibits persistently low water uptake (\u2248162 wt% after 900 days), suppresses swelling\u2010induced deterioration of interfacial adhesion, and maintains a shear adhesion strength of \u2248110\u00a0kPa after 900 days of seawater immersion. The hydrogel coating also exhibits antibacterial and anti\u2010algal activity for marine antifouling, underwater superoleophobicity, and applicability as a gel electrolyte for flexible supercapacitors. This work establishes a design principle for achieving long\u2010term underwater functional hydrogels beyond previously reported time scales and provides a general strategy for developing continuously curing materials in underwater and marine environments.<\/jats:p>","DOI":"10.1002\/adma.74463","type":"journal-article","created":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T14:04:57Z","timestamp":1785852297000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Self\u2010Strengthening Hydrogel Coating for Long\u2010Term Underwater Adhesion in Seawater Over 900 Days"],"prefix":"10.1002","volume":"38","author":[{"given":"Guangling","family":"He","sequence":"first","affiliation":[{"name":"Frontiers Science Center For Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education Ocean University of China  Qingdao 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