--- product_id: 725604801 title: "121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear)" brand: "wacker" price: "¥4059" currency: JPY in_stock: true category: "Wacker" url: https://www.desertcart.jp/products/725604801-121-professional-aquarium-fish-tank-silicone-sealant-small-to-large store_origin: JP region: Japan --- # fast curing speed 100% waterproof & water resistant 360 lbs tensile strength 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear) **Brand:** wacker **Price:** ¥4059 **Availability:** ✅ In Stock ## Summary > 🔧 Seal like a pro, swim worry-free! ## Quick Answers - **What is this?** 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?** ¥4059 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/725604801-121-professional-aquarium-fish-tank-silicone-sealant-small-to-large) ## 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 - • **Versatile Application:** Ideal for glass, plastics, ceramics, and more—professional-grade for all your glazing needs. - • **Fish-Safe & FDA Approved:** Non-toxic formula ensures a safe, healthy environment for your aquatic life. - • **Long-Term Water Resistance:** Seals won’t crack, shrink, or yellow—guaranteed watertight performance under pressure. - • **Effortless Precision Sealing:** High viscosity paste with smooth, fast curing for clean, flawless aquarium repairs. - • **Unmatched Aquarium Bonding Power:** Engineered in Germany for superior strength and durability, perfect for tanks of all sizes. ## Overview Wacker 121 is a premium German-made silicone sealant designed for professional aquarium construction and repair. With 360 lbs tensile strength, FDA approval for aquatic safety, and fast curing, it delivers a durable, waterproof bond that resists cracking and yellowing. Perfect for small to large tanks, it ensures long-lasting, toxin-free protection for your fish and aquatic setups. ## 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. ## 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 | #36,461 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #104 in Silicone Sealers | | Brand Name | Wacker | | Color | Clear/Transparent | | Compatible Material | Glass | | Container Type | Tube | | Customer Reviews | 4.3 4.3 out of 5 stars (408) | | Item Form | Paste | | Item Package Quantity | 1 | | Item Weight | 420 Grams | | Manufacturer | Wacker | | Material Type | Silicone | | Model | WCK121 | | Number of Pieces | 1 | | Other Special Features of the Product | Non Toxic, Strong | | Part Number | WCK121 | | Tensile Strength | 360 Pounds | | Unit Count | 310 Milliliters | | Viscosity Level | High | | Volume | 310 Milliliters | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** Wacker - **Colour:** Clear/Transparent - **Item form:** Paste - **Material:** Silicone - **Special features:** Non Toxic, Strong ## Images ![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) ## 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.jp/products/725604801-121-professional-aquarium-fish-tank-silicone-sealant-small-to-large](https://www.desertcart.jp/products/725604801-121-professional-aquarium-fish-tank-silicone-sealant-small-to-large) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-12*