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King British Watertight Silicon Aquarium Sealant

King British
(Code: KB01800)

About King British Watertight Silicon Aquarium Sealant

Ideal for use when building or repairing aquaria, mounting valves and sealing connections, the King British Aquarium Sealant Tube creates a waterproof seal.

Offering excellent adhesion even under extreme pressure, the silicon sealant is harmless to freshwater and marine (saltwater) fish when fully cured before the aquarium is filled.


  • All surfaces to be sealed must be clean, dry and free from grease. Surfaces can be cleaned using methylated spirits, applied to a tissue or cloth, before applying the sealant. 
  • Remove cap and pierce tube diaphragm (25g size) / Remove nozzle, cut off end of plastic cartridge and screw on nozzle (78g size).
  • Cut tip of nozzle to required width of seal.
  • The nozzle opening must always be wider than the joint to be sealed, allowing sealant to make contact with both surfaces.
  • Press tip of nozzle against the sides of the joint and hold the tube/cartridge at a 45 degree angle.
  • Push the tube/cartridge while applying a steady, even pressure at the base.
  • Ensure that a bead of sealant is ahead of the nozzle as it moves forward. 
  • Smooth any inconsistencies to the finished bead with a wet instrument such as a spoon or spatula.
  • Smooth surfaces lightly ensuring sealant makes contact with both surfaces whilst still un-cured. 
  • Any excess of misapplied sealant should be removed whilst still un-cured using a tissue or cloth soaked in methylated spirits. 
  • After completing the application, ensure that the sealant is kept dry and undisturbed for at least 48 hours.