The Juwel Silexo Aquarium silicon is suitable for all works on or in aquariums, e.g. cementing structure backgrounds or filters in place. Take care to ensure that the surfaces to be cemented are absolutely clean and dry before applying the Juwel Aquarium silicon. A dry skin forms on the surface of the silicon after just a few minutes. The silicon is firm after approx. one hour. Wait 24 hours before filling the aquarium with water as only then will the silicon be fully hardened.Do you have questions about this article ?