---
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: "3207 som"
currency: KGS
in_stock: true
reviews_count: 8
category: "Wacker"
url: https://www.desertcart.kg/products/232920710-wacker-121-professional-aquarium-fish-tank-silicone-sealant-small-to
store_origin: KG
region: Kyrgyzstan
---

# fast curing, professional grade 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:** 3207 som
**Availability:** ✅ In Stock

## Summary

> 💧 Seal it like a pro—secure your aquatic world with Wacker 121!

## 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?** 3207 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/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

- • **Versatile Industrial Use:** Perfect for glazing, bonding, and repairs on glass, plastics, ceramics, and more—your all-in-one sealant.
- • **Long-Term Water Resistance:** Resists cracking, shrinking, and yellowing even under constant water pressure—built to last decades.
- • **Aquarium-Safe & FDA Approved:** Non-toxic, odorless formula ensures a safe habitat for your aquatic life, freshwater or saltwater.
- • **Unmatched Strength & Durability:** Engineered to hold massive aquarium glass with 360 lbs tensile strength—no wobble, no leaks.
- • **Precision Application & Fast Cure:** Smooth, high-viscosity paste that cures quickly for clean, professional seals every time.

## Overview

Wacker 121 Professional Aquarium Silicone Sealant is a premium-grade, FDA-approved, clear silicone designed for strong, waterproof bonding and gap filling in aquarium construction. Trusted by professionals for over 20 years, it offers superior tensile strength (360 lbs), fast curing, and long-lasting resistance to water pressure, cracking, and yellowing. Safe for all aquatic life and suitable for small to large tanks, it ensures a flawless, durable seal for freshwater and saltwater environments.

## 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 | #4,427 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Silicone Adhesives |
| Brand | Wacker |
| Colour | Clear/Transparent |
| Customer Reviews | 4.3 4.3 out of 5 stars (349) |
| Date First Available | 28 September 2020 |
| Generic Name | Aquarium Silicone Sealant |
| Importer | Wacker Chemie |
| Included Components | Nozzle |
| Item Dimensions LxWxH | 49 x 63 x 93 Millimeters |
| Item Form | Paste |
| Item Height | 9.3 Centimeters |
| Item Package Quantity | 1 |
| Item Volume | 310 Millilitres |
| Item Weight | 420 g |
| Item Width | 6.3 Centimeters |
| Item model number | WCK121 |
| Manufacturer | Wacker, Wacker |
| Material | Silicone |
| Model number | WCK121 |
| Net Quantity | 310 Milliliters |
| Number of Memory Sticks | 1 |
| Package Information | Tube |
| Packer | Authorized Seller Taj Products, sellerplywoodproducts@gmail.com |
| Product Dimensions | 4.9 x 6.3 x 9.3 cm; 420 g |
| Special Feature | Non Toxic, Strong |
| Specific Uses For Product | Glazing, Industrial Bonding Applications, Aquarium Tank Construction |
| Tensile Strength | 360 Pounds |
| Viscosity | High |
| Viscosity Level | High |
| 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)

## 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.

### ⭐⭐⭐⭐ Nice quality
*by N***A on 31 May 2025*

Very nice Product, bonding between two parts too good

## 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 Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-02-20*