Seal and repair with confidence using ADHESIVE GURU AG310 Aquarium Silicone Sealant—formulated with 100% pure silicone for safe and lasting performance in aquatic environments. This clear-drying sealant is ideal for sealing leaks, bonding glass, and attaching decorative elements in aquariums or underwater DIY projects. It contains no additives, fungicides, or chemicals that could harm fish, making it perfect for aquarium repairs and builds. Designed for strong adhesion and long-term flexibility, it won't crack, shrink, or degrade over time. Whether you're fixing seams, crafting terrariums, or creating underwater decor, this waterproof silicone is a must-have for both hobbyists and pros. - 100% silicone formula—no additives or fungicides - Safe for fish, aquatic plants, and marine environments - Strong adhesion for glass bonding and underwater use - Dries clear for seamless, invisible repairs - Flexible and durable seal—won’t shrink or crack - Easy to apply with a standard caulking gun - How to Use: 1) Ensure the application surfaces are clean and dry. If needed, apply masking tape to protect adjacent areas. 2) Cut off the end of the tube to open it. 3) Trim the nozzle tip to the desired size and attach it to the tube. 4) Insert the tube into a caulking gun. 5) Apply the sealant evenly to the surface. Smooth it with a tool or a gloved finger to fill the application area. 6) After use, reattach the cap on the nozzle to prevent curing. 7) Remove the masking tape. If needed, use clamps to hold surfaces together until the sealant cures. 8) Wipe away any excess sealant with a cloth dampened with solvent before it cures. Once cured, the sealant can only be removed mechanically. - Touch-dry in 1–2 hours; fully cures in 24 hours. Avoid direct water exposure before the sealant is fully cured. - Non-paintable - Store in a cool and dry place between 40°F to 75°F, away from direct sunlight and heat sources