---
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: "KD 3.40"
currency: KWD
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.kw/products/232920710-wacker-121-professional-aquarium-fish-tank-silicone-sealant-small-to
store_origin: KW
region: Kuwait
---

# 100% waterproof & water resistant 360 lbs tensile strength FDA approved, non-toxic & fish safe Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear)

**Brand:** wacker
**Price:** KD 3.40
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal like a pro, protect like a champion!

## 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?** KD 3.40 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/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

- • **Aquarium-Safe Formula:** FDA-approved and non-toxic, ensuring your aquatic life thrives in a perfectly sealed environment.
- • **Versatile Bonding Power:** Perfect for glass, plastics, ceramics, and more—ideal for small to monster-sized tanks.
- • **Fast & Precise Application:** High viscosity paste with smooth flow for clean, professional-grade seals every time.
- • **Long-Term Water Resistance:** Resists cracking, shrinking, and yellowing even under constant water pressure—built to last.
- • **Unmatched Strength & Durability:** Engineered to hold massive aquarium glass with 360 lbs tensile strength—no wobble, no leaks.

## Overview

Wacker 121 Professional Aquarium Silicone Sealant is a premium German-engineered, FDA-approved adhesive designed for strong, waterproof bonding and gap filling in aquarium construction. With 360 lbs tensile strength and high viscosity, it ensures durable, non-toxic seals that resist cracking and yellowing, making it the trusted choice for both freshwater and saltwater tanks of all sizes.

## 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: Works well - Very good product

## 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 | #8,164 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #33 in Silicone Adhesives |
| Brand | Wacker |
| Brand Name | Wacker |
| Colour | Clear/Transparent |
| Compatible Material | Glass, Stone |
| Container Type | Tube |
| Customer Reviews | 4.2 out of 5 stars 382 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)
![Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear) - Image 2](https://m.media-amazon.com/images/I/51-7mLb8NQL.jpg)
![Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear) - Image 3](https://m.media-amazon.com/images/I/613gvPZhUCL.jpg)
![Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear) - Image 4](https://m.media-amazon.com/images/I/618rQczFfsL.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.

### ⭐⭐⭐⭐⭐ Works well
*by P***R on 15 March 2026*

Very good product

### ⭐⭐⭐⭐ 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).

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-05-16*