--- product_id: 232920710 title: "Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear)" brand: "wacker" price: "108.43 DT" currency: TND in_stock: true reviews_count: 8 category: "Wacker" url: https://www.desertcart.tn/products/232920710-wacker-121-professional-aquarium-fish-tank-silicone-sealant-small-to store_origin: TN region: Tunisia --- # 100% waterproof & water resistant 360 lbs tensile strength Premium German engineering Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear) **Brand:** wacker **Price:** 108.43 DT **Availability:** ✅ In Stock ## Summary > 💧 Seal your aquatic masterpiece with German precision and pro-grade strength! ## Quick Answers - **What is this?** Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear) by wacker - **How much does it cost?** 108.43 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/232920710-wacker-121-professional-aquarium-fish-tank-silicone-sealant-small-to) ## Best For - wacker enthusiasts ## Why This Product - Trusted wacker brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durability That Defies Time:** Resists cracking, shrinking, and yellowing even under constant water pressure for decades. - • **Aquarium-Safe & FDA Approved:** Non-toxic formula guarantees a safe habitat for your aquatic life, freshwater or saltwater. - • **Versatile & Professional Grade:** Perfect for glass, plastics, ceramics, and industrial glazing—trusted by aquarium pros worldwide. - • **Unmatched Aquarium Bonding Power:** 360 lbs tensile strength ensures rock-solid, leak-proof seals for tanks of any size. - • **Fast-Curing, Odorless Application:** Smooth, quick-dry paste lets you seal with precision—no fumes, no mess, no waiting around. ## Overview Wacker 121 is a premium-grade, FDA-approved silicone sealant engineered in Germany for professional aquarium construction and repair. With a tensile strength of 360 lbs and superior waterproof properties, it delivers durable, odorless, and fish-safe bonding for tanks ranging from small to monster-sized. Trusted by experts for over 20 years, it offers fast curing, excellent adhesion, and long-term resistance to cracking and yellowing under water pressure. ## Description For over two decades, aquarium professionals have trusted Wacker 121 to securely seal monster-sized aquarium glasses. This high-performance silicone sealant provides unbeatable adhesion, ensuring a watertight and durable bond for large custom aquariums. Ideal for both freshwater and saltwater setups, Wacker 121 is formulated to resist cracking, shrinking, and yellowing over time, even under constant water pressure. - *Superior Strength:* Designed to withstand extreme aquarium sizes and volumes. - *Reliable & Long-lasting:* Decades of proven use in professional aquarium setups. - *Safe for Aquatic Life:* Non-toxic, fully aquarium-safe once cured. - *Easy Application:* Smooth application for clean, precise seals. Review: Super & Excellent quality Silicon sealant for aquarium 👍🏻 - The best silicon sealant for aquarium. Typical German world class quality. I love German products. Super happy to use it for my newly built massive aquarium. Highly recommended to others. Excellent quality. Review: Best silicon ever in the market, for aquarium. - Great product, dry instantly and very strong bond. My 400L aquarium seems pretty strong with this. Even you can't see any wobble of Glass when pulls or push like other silicon glues. But you need to carefully apply this one. Highly professional. I had used 2 bottle. After that i bought another astral brand silicon one from local shop, then only i realised about the quality of this wacker product, it's 100% greater than any other product in the market. The astral silicon i brought from the shop had a worst smell also it takes more than 24 hrs for dry. And also not having water holding capacity. But this one is great. Only cons i had was they don't sell smaller ones. If i need a 50ml or 100ml i have no choice for choosing this one. Because this product can't be stored for long after the seal broken. ## Features - ✔️ PREMIUM GRADE ---> Made in Germany, Wacker 121 is a high performance silicone sealant designed for strong Bonding, Gap Filling & Repair of aquarium tanks, fish tanks and other glazing applications. Suitable for small to large size tank construction. - ✔️ FDA APPROVED ---> FDA approved for fish and other aquatic animals. No toxins in it, safe and fish friendly. - ✔️ FEATURES & BENEFITS ---> Excellent Long-term water resistance *★* Suitable for glass, plastics, ceramic products, and more *★* High strength, high toughness, high viscosity *★* Fast curing speed *★* Suitable for objects under water pressure *★* Excellent mechanical properties *★* Usage for wide variety of Glazing & Industrial applications - ✔️ ENVIRONMENTAL ✔️ ODORLESS ✔️ WATERPROOF ✔️ HIGH-QUALITY ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08KGVHJJ8 | | Best Sellers Rank | #2,819 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #18 in Silicone Adhesives | | Brand | Wacker | | Brand Name | Wacker | | Colour | Clear/Transparent | | Compatible Material | Glass, Stone | | Container Type | Tube | | Country of Publication | India | | Customer Reviews | 4.3 out of 5 stars 402 Reviews | | Importer Contact Information | Wacker Chemie | | Included Components | Nozzle | | Item Form | Paste | | Item Package Quantity | 1 | | Item Type Name | Aquarium Silicone Sealant | | Item Weight | 420 Grams | | Manufacturer | Wacker, Wacker | | Manufacturer Contact Information | Wacker | | Manufacturer Part Number | WCK121 | | Material | Silicone | | Material Type | Silicone | | Model | WCK121 | | Other Special Features of the Product | Non Toxic, Strong | | Packer Contact Information | Authorized Seller Taj Products, sellerplywoodproducts@gmail.com | | Special Feature | Non Toxic, Strong | | Specific Uses For Product | Glazing, Industrial Bonding Applications, Aquarium Tank Construction | | Tensile Strength | 360 Pounds | | Unit Count | 310 Milliliters | | Viscosity Level | High | | Volume | 310 Millilitres | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** Wacker - **Item Form:** Paste - **Material:** Silicone - **Special Feature:** Non Toxic, Strong - **Specific Uses For Product:** Glazing, Industrial Bonding Applications, Aquarium Tank Construction ## Images ![Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear) - Image 1](https://m.media-amazon.com/images/I/410-A9QCDCL.jpg) ## Questions & Answers **Q: Does it suitable for 24"×10"×12". But Using 6mm glass??** A: Yes, Suitable **Q: Does it become solid or elastic after applied?** A: Solid **Q: Delivery charge havi I want to 121 Aquarium sealant is six names place Chang the delivery charge** A: Not possible. **Q: Does it comes with application gun?** A: We have added the listing that contains applicator gun ## Customer Reviews ### ⭐⭐⭐⭐⭐ Super & Excellent quality Silicon sealant for aquarium 👍🏻 *by A***N on 27 March 2026* The best silicon sealant for aquarium. Typical German world class quality. I love German products. Super happy to use it for my newly built massive aquarium. Highly recommended to others. Excellent quality. ### ⭐⭐⭐⭐⭐ Best silicon ever in the market, for aquarium. *by A***Q on 7 March 2024* Great product, dry instantly and very strong bond. My 400L aquarium seems pretty strong with this. Even you can't see any wobble of Glass when pulls or push like other silicon glues. But you need to carefully apply this one. Highly professional. I had used 2 bottle. After that i bought another astral brand silicon one from local shop, then only i realised about the quality of this wacker product, it's 100% greater than any other product in the market. The astral silicon i brought from the shop had a worst smell also it takes more than 24 hrs for dry. And also not having water holding capacity. But this one is great. Only cons i had was they don't sell smaller ones. If i need a 50ml or 100ml i have no choice for choosing this one. Because this product can't be stored for long after the seal broken. ### ⭐⭐⭐⭐ Good quality *by H***H on 31 January 2026* “i build 4 feet height 2 feet lenggt tank. The gum is super strong, but it’s very hard to use. It dries very fast—within about 10 minutes it starts getting hard—but once set, the gum is very strong.” ## Frequently Bought Together - Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear) - BIONIX Freshwater Master Test Kit (200 Test). --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/232920710-wacker-121-professional-aquarium-fish-tank-silicone-sealant-small-to](https://www.desertcart.tn/products/232920710-wacker-121-professional-aquarium-fish-tank-silicone-sealant-small-to) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-01*