---
product_id: 725604801
title: "121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear)"
brand: "wacker"
price: "131 Lei"
currency: RON
in_stock: true
url: https://www.desertcart.ro/products/725604801-121-professional-aquarium-fish-tank-silicone-sealant-small-to-large
store_origin: RO
region: Romania
---

# FDA-approved, fish-safe formula Long-term water resistance 310ml high-viscosity sealant 121 Professional Aquarium, Fish Tank Silicone Sealant | Small to Large Tanks | Bonding, Gap Filling & Repair | Safe for Fish (310ml - Clear)

**Brand:** wacker
**Price:** 131 Lei
**Availability:** ✅ In Stock

## Summary

> 🐠 Seal the deal 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?** 131 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/725604801-121-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

- • **Rapid Cure Time:** Fast-setting silicone lets you get your tank up and running without delay.
- • **Fish-Friendly Formula:** FDA-approved and toxin-free, guaranteeing a safe habitat for your aquatic friends.
- • **Odorless & Waterproof:** No unpleasant smells and 100% waterproof for a clean, professional finish every time.
- • **Versatile Application:** Perfect for glass, plastics, ceramics, and more—ideal for all your aquarium and glazing needs.
- • **Unmatched Aquarium Bonding:** Premium German engineering ensures ultra-strong, durable seals for tanks of all sizes.

## Overview

Wacker 121 Professional Aquarium Silicone Sealant is a premium, German-made, FDA-approved 310ml sealant designed for strong, waterproof bonding and gap filling in aquariums of all sizes. Its fast curing, high viscosity, and fish-safe formula make it the go-to choice for durable, odorless, and versatile aquarium repairs and constructions.

## 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.

## 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

## Product Details

- **Brand:** Wacker
- **Material:** Silicone
- **Item form:** Paste
- **Special features:** Non Toxic, Strong
- **Colour:** Clear/Transparent

## 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)

## 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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**Shop now:** [https://www.desertcart.ro/products/725604801-121-professional-aquarium-fish-tank-silicone-sealant-small-to-large](https://www.desertcart.ro/products/725604801-121-professional-aquarium-fish-tank-silicone-sealant-small-to-large)

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-01-22*