Possible Clues:

• Repair material
• Pair of creatures, big and small, that makes a bond
• Directed to cover aluminium with a protective substance
• Deck application
• Man investing in firm substance for stopping leaks
• Constituency must keep network impenetrable with this preparation
• Material to make watertight
• Marine worker enclosing large water barrier?
• Glue, perhaps, joining two animals?
• Sugar, maybe, fed to group -- that fills a gap