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Aquarium Silicone Sealant

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Help and advice on shopping for: Aquarium Silicone Sealant

Aquarium Silicone Sealant is used to line, seal and build glass fish tanks. It's specifically designed to be fish and invertebrate safe and is both strong and flexible once cured.

Do I need a silicone gun for aquarium silicone sealant?

Smaller tubes of aquarium silicone can either be squeezed by hand or include an applicator. Large 310ml tubes of silicone require a standard caulking or silicone gun in order to use them. Silicone guns are available separately.

Can aquarium silicone be used underwater?

Aquarium silicone should only be applied to dry, clean surfaces. For underwater sealants and adhesives try a specific pond sealant instead. Once aquarium silicone is cured it is fully waterproof.

How long does it take for aquarium silicone to cure?

Typically, aquarium silicone takes 24 hours to cure and "go off." It should then have formed a strong but flexible permanent bond. For building large aquariums, different rules apply. Aquarium manufacturers may advise one whole day of cure time per mm of glass thickness, so a full ten days for 10mm thick aquarium glass panels before it can be filled with water. If just applying new silicone over the seal on a leaky fish tank, 24 hour cure time should be fine.

Is aquarium silicone the same as bathroom sealant?

No, bathroom, kitchen, and other sealants often contain mold inhibitors and as such aren't safe for use in aquariums or with fish and invertebrates. They aren't as strong as aquarium-safe silicone either so wouldn't be able to deal with the water pressure of a filled aquarium.

Can I use aquarium silicone to stick an aquarium background on?

Yes, aquarium silicone is the perfect adhesive for sticking structured or 3D aquarium backgrounds inside fish tanks. Apply liberal amounts to the back, push firmly against the tank glass and wait at least 24 hours before filling.