---
product_id: 232920710
title: "121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear)"
brand: "wacker"
price: "฿1032"
currency: THB
in_stock: true
reviews_count: 8
category: "Wacker"
url: https://www.desertcart.co.th/products/232920710-121-professional-aquarium-fish-tank-silicone-sealant-small-to-large
store_origin: TH
region: Thailand
---

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

**Brand:** wacker
**Price:** ฿1032
**Availability:** ✅ In Stock

## Summary

> 🐠 Seal your aquatic masterpiece with Wacker 121 — where strength meets safety!

## 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?** ฿1032 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/232920710-121-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

- • **Professional-Grade Precision:** High viscosity paste allows smooth, clean application for flawless, leak-proof aquarium construction.
- • **Versatile Application Mastery:** Perfect for glass, plastics, ceramics, and more — ideal for both freshwater and saltwater setups.
- • **Fish-Safe & Eco-Friendly Formula:** FDA-approved and odorless, ensuring a toxin-free environment for your aquatic life.
- • **Unmatched Aquarium Bonding Power:** Engineered in Germany for ultra-strong, durable seals that hold up to massive tanks and water pressure.
- • **Fast Curing, Long-Lasting Performance:** Quick drying with superior resistance to cracking, shrinking, and yellowing over years of underwater use.

## Overview

Wacker 121 is a premium German-made silicone sealant designed specifically for aquarium construction and repair. With a tensile strength of 360 pounds, it delivers watertight, durable bonds suitable for tanks of all sizes. FDA-approved and non-toxic, it ensures a safe habitat for fish and aquatic animals. Its fast curing, odorless formula resists cracking and yellowing, making it the trusted choice of professionals for over 20 years.

## 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: Ideal for aquarium - Perfect for aquarium. Settles well. But give it 3 to 4 days to settle.
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 | #1,704 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Silicone Adhesives |
| Brand | Wacker |
| Brand Name | Wacker |
| Colour | Clear/Transparent |
| Compatible Material | Glass, Stone |
| Container Type | Tube |
| Customer Reviews | 4.3 out of 5 stars 355 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 |
| 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 | 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

![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)
![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)
![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)
![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

### ⭐⭐⭐⭐⭐ Ideal for aquarium
*by P***S on 26 December 2025*

Perfect for aquarium. Settles well. But give it 3 to 4 days to settle.

### ⭐⭐⭐⭐⭐ 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 Thailand*
*Store origin: TH*
*Last updated: 2026-03-10*