--- product_id: 725604801 title: "Wacker 121 Professional Aquarium Silicone Sealant for Aquariums, Small to Large Aquariums, Gluing, Gap Filling and Repairs, Safe for Fish (310 ml, Clear)" brand: "wacker" price: "¥8555" currency: JPY in_stock: true category: "Wacker" url: https://www.desertcart.jp/products/725604801-wacker-121-professional-aquarium-silicone-sealant-for-aquariums-small-to store_origin: JP region: Japan --- # fast curing speed 100% waterproof & water resistant 360 lbs tensile strength Wacker 121 Professional Aquarium Silicone Sealant for Aquariums, Small to Large Aquariums, Gluing, Gap Filling and Repairs, Safe for Fish (310 ml, Clear) **Brand:** wacker **Price:** ¥8555 **Availability:** ✅ In Stock ## Summary > 🐠 Seal with confidence, swim with style! ## Quick Answers - **What is this?** Wacker 121 Professional Aquarium Silicone Sealant for Aquariums, Small to Large Aquariums, Gluing, Gap Filling and Repairs, Safe for Fish (310 ml, Clear) by wacker - **How much does it cost?** ¥8555 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-wacker-121-professional-aquarium-silicone-sealant-for-aquariums-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 - • **Versatile Application:** Ideal for glass, plastics, ceramics, and more—professional-grade for all your sealing 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 application 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 specifically for aquarium construction and repair. With 360 lbs tensile strength, fast curing, and FDA approval for aquatic safety, it delivers a durable, waterproof bond that resists cracking and yellowing. Trusted by professionals for over 20 years, it’s perfect for small to large tanks and multiple glazing applications. ## 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 Quality: Made in Germany, Wacker 121 is a high-performance silicone sealant designed for strong bonding, gap filling, and repair of aquariums, fish tanks, and other glazing applications. Suitable for small to large tank construction. - ✔️ FDA Approved: FDA approved for fish and other aquatic animals. No toxins, 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. Suitable for a variety of glazing and industrial applications - Environmentally friendly, odourless, waterproof, high quality ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08KGVHJJ8 | | Best Sellers Rank | #91,121 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #206 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 (416) | | Item Form | Paste | | Item Package Quantity | 1 | | Item Weight | 420 Grams | | Manufacturer | Wacker | | Material Type | Silicone | | Model | WCK121 | | Number of Packs | 1 | | 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 ![Wacker 121 Professional Aquarium Silicone Sealant for Aquariums, Small to Large Aquariums, Gluing, Gap Filling and Repairs, Safe for Fish (310 ml, Clear) - Image 1](https://m.media-amazon.com/images/I/21Qhq5Hrm9L.jpg) ![Wacker 121 Professional Aquarium Silicone Sealant for Aquariums, Small to Large Aquariums, Gluing, Gap Filling and Repairs, Safe for Fish (310 ml, Clear) - Image 2](https://m.media-amazon.com/images/I/31CKsAraW0L.jpg) ![Wacker 121 Professional Aquarium Silicone Sealant for Aquariums, Small to Large Aquariums, Gluing, Gap Filling and Repairs, Safe for Fish (310 ml, Clear) - Image 3](https://m.media-amazon.com/images/I/613gvPZhUCL.jpg) ![Wacker 121 Professional Aquarium Silicone Sealant for Aquariums, Small to Large Aquariums, Gluing, Gap Filling and Repairs, Safe for Fish (310 ml, Clear) - Image 4](https://m.media-amazon.com/images/I/41nBs4238rL.jpg) ![Wacker 121 Professional Aquarium Silicone Sealant for Aquariums, Small to Large Aquariums, Gluing, Gap Filling and Repairs, Safe for Fish (310 ml, Clear) - Image 5](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-wacker-121-professional-aquarium-silicone-sealant-for-aquariums-small-to](https://www.desertcart.jp/products/725604801-wacker-121-professional-aquarium-silicone-sealant-for-aquariums-small-to) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-11-03*