Related Clues:

• Makes an impression on?
• Makes watertight
• Makes waterproof
• Shar-peis, e.g.
• Some boxers
• 'Reservoir --'
• Signs of approval?
• See 30 Across
• Marine mammals
• Certificate features
• Furry sea mammals
• Official emblems
• Feet, informally
• Aquatic mammals
• Tracks relentlessly