---
product_id: 725604774
title: "Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish - FDA Approved (310ml - Clear)"
brand: "wacker"
price: "53.96 DT"
currency: TND
in_stock: false
reviews_count: 5
url: https://www.desertcart.tn/products/725604774-wacker-121-professional-aquarium-fish-tank-silicone-sealant-small-to
store_origin: TN
region: Tunisia
---

# Long-term waterproof seal Fast curing speed High strength & toughness Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish - FDA Approved (310ml - Clear)

**Brand:** wacker
**Price:** 53.96 DT
**Availability:** ❌ Out of Stock

## Summary

> 🐠 Seal the deal with Wacker 121 — where strength meets fish-friendly finesse!

## Quick Answers

- **What is this?** Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish - FDA Approved (310ml - Clear) by wacker
- **How much does it cost?** 53.96 DT with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/725604774-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

- • **Rapid Cure Time:** Get your tank ready faster with quick-setting, high-viscosity sealant.
- • **Versatile Application:** Perfect for glass, plastics, ceramics, and more—small or large tanks, no limits.
- • **Odorless & Eco-Friendly:** Enjoy a clean, odor-free application that’s safe for you and the environment.
- • **Fish-Safe & FDA Approved:** 100% toxin-free formula ensuring a safe habitat for your aquatic life.
- • **Unmatched Aquarium Bonding:** Premium German silicone engineered for durable, leak-proof tank construction.

## Overview

Wacker 121 Professional Aquarium Sealant is a premium, FDA-approved silicone designed in Germany for strong, waterproof bonding and gap filling in aquarium tanks of all sizes. Its fast curing, high toughness, and odorless formula ensure safe, durable repairs and construction, compatible with glass, plastics, and ceramics, making it the go-to sealant for aquatic professionals and enthusiasts alike.

## Description

Safety data sheet available on request. ✔️ 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

Review: Best Aquarium Grade Silicon! - This is high quality made in Germany aquarium grade silicon (Not all silicon companies state this but this one does) It is a lot thicker than Dowsil and others that I have used in the past which made it difficult to inject it in between the glass panes so I had to return the second one. Even then this is by far the best silicon available in desertcart.in for aquariums. EDIT: Aug 2022. Purchased this again and built a large aquarium using silicon injection method. This time the project was smooth. This is a very high quality "Aquarium grade" silicon. Best available in India for sure. Mind you it is a bit harder to work with as it dries faster and is thicker than the popular Dowsil silicon. Very happy with the results. Will definitely use it again if I ever build another fish tank.
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

- Safety data sheet available on request.
- ✔️ 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 |
| Brand | Wacker |
| Colour | Clear/Transparent |
| Compatible Material | Ceramic |
| Customer Reviews | 4.3 out of 5 stars 400 Reviews |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Item Volume | 310 Millilitres |
| Item Weight | 420 Grams |
| Item form | Paste |
| Item package quantity | 1 |
| Item volume | 310 Millilitres |
| Manufacturer | Wacker |
| Manufacturer Part Number | WCK121 |
| Model Number | WCK121 |
| Unit Count | 310.0 millilitre |
| Water Resistance Level | Waterproof |
| Water resistance level | Waterproof |

## Product Details

- **Brand:** Wacker
- **Colour:** Clear/Transparent
- **Item form:** Paste
- **Item package quantity:** 1
- **Item volume:** 310 Millilitres

## Images

![Wacker 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish - FDA Approved (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 - FDA Approved (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 - FDA Approved (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 - FDA Approved (310ml - Clear) - Image 4](https://m.media-amazon.com/images/I/618rQczFfsL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best Aquarium Grade Silicon!
*by V***D on 13 May 2021*

This is high quality made in Germany aquarium grade silicon (Not all silicon companies state this but this one does) It is a lot thicker than Dowsil and others that I have used in the past which made it difficult to inject it in between the glass panes so I had to return the second one. Even then this is by far the best silicon available in Amazon.in for aquariums. EDIT: Aug 2022. Purchased this again and built a large aquarium using silicon injection method. This time the project was smooth. This is a very high quality "Aquarium grade" silicon. Best available in India for sure. Mind you it is a bit harder to work with as it dries faster and is thicker than the popular Dowsil silicon. Very happy with the results. Will definitely use it again if I ever build another fish tank.

### ⭐⭐⭐⭐⭐ 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: 2026-08-11*