---
product_id: 725604801
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: "162.35 DT"
currency: TND
in_stock: true
reviews_count: 5
category: "Wacker"
url: https://www.desertcart.tn/products/725604801-wacker-121-professional-aquarium-fish-tank-silicone-sealant-small-to
store_origin: TN
region: Tunisia
---

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

**Brand:** wacker
**Price:** 162.35 DT
**Availability:** ✅ In Stock

## Summary

> 🐟 Seal with confidence, swim in style!

## 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?** 162.35 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/725604801-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

- • **Versatile Application:** Perfect for glass, plastics, ceramics, and more—ideal for small to giant custom tanks.
- • **Aquarium-Safe & Non-Toxic:** FDA-approved formula ensures zero toxins, keeping your aquatic life thriving and safe.
- • **Fast Curing, Long-Lasting Seal:** Quick-dry technology delivers a waterproof, crack-resistant seal that stands the test of time.
- • **Odorless & Professional Finish:** Smooth, clean application with no unpleasant smell, giving your aquarium a flawless look.
- • **Unmatched Strength & Durability:** Engineered to hold massive aquarium glass with 360 lbs tensile strength for rock-solid bonding.

## Overview

Wacker 121 Professional Aquarium Silicone Sealant is a premium German-engineered, FDA-approved silicone paste designed for strong, waterproof bonding and gap filling in aquariums of all sizes. With 360 lbs tensile strength, fast curing, and a non-toxic formula safe for aquatic life, it delivers a durable, odorless seal trusted by professionals worldwide.

## 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 | #88,626 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #192 in Silicone Sealers |
| Brand | Wacker |
| Brand Name | Wacker |
| Color | Clear/Transparent |
| Colour | Clear/Transparent |
| Compatible Material | Glass |
| Container Type | Tube |
| Customer Reviews | 4.3 out of 5 stars 398 Reviews |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Item Weight | 420 Grams |
| Item form | Paste |
| Manufacturer | Wacker |
| Material | Silicone |
| Material Type | Silicone |
| Model | WCK121 |
| Other Special Features of the Product | Non Toxic, Strong |
| Part Number | WCK121 |
| Special features | Non Toxic, Strong |
| Specific Uses For Product | Aquarium |
| Specific uses for product | Aquarium |
| 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, 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)

## 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).

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-07-31*