---
product_id: 670698580
title: "Stanley S420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack"
brand: "stanley"
price: "R831"
currency: ZAR
in_stock: true
reviews_count: 6
category: "Stanley"
url: https://www.desertcart.co.za/products/670698580-stanley-s420-aquarium-silicone-sealant-clear-2x10-1-fl-oz
store_origin: ZA
region: South Africa
---

# Rapid 2-hour cure time Non-toxic, fish & plant safe 100% solventless, waterproof seal Stanley S420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack

**Brand:** stanley
**Price:** R831
**Availability:** ✅ In Stock

## Summary

> 🐟 Seal the deal with clarity and confidence!

## Quick Answers

- **What is this?** Stanley S420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack by stanley
- **How much does it cost?** R831 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/670698580-stanley-s420-aquarium-silicone-sealant-clear-2x10-1-fl-oz)

## Best For

- stanley enthusiasts

## Why This Product

- Trusted stanley brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile & Clear:** Adheres flawlessly to glass, aluminum, and more, with a crystal-clear finish that keeps your aquarium looking pristine.
- • **Aquarium-Safe Formula:** Non-toxic and safe for all aquatic life, perfect for both freshwater and saltwater ecosystems.
- • **Fast-Track Your Projects:** Cures quickly with atmospheric moisture in just 2 hours, minimizing downtime and maximizing efficiency.
- • **Sun & Chemical Resistant:** Engineered to resist UV rays and harsh chemicals, maintaining strength and clarity in any environment.
- • **Unbreakable Underwater Bond:** 100% solventless silicone ensures a flexible, durable seal that stands the test of time and water pressure.

## Overview

Stanley S420 Aquarium Silicone Sealant Clear is a premium, 100% solventless silicone designed for durable, waterproof bonding in aquariums. Non-toxic and safe for all aquatic life, it cures rapidly in 2 hours, resists UV and chemicals, and offers versatile adhesion to glass and metal surfaces—ideal for maintaining vibrant, leak-free aquatic environments.

## Description

Stanley S420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack: desertcart.com: Industrial & Scientific

Review: Works well - Works great.
Review: Good product - Works well

## Features

- 100% Solventless Silicone - This sealant is formulated from 100% solventless silicone, ensuring a robust and durable seal that maintains flexibility over time. It’s perfect for aquariums, providing a secure and reliable bond that withstands the pressures of underwater environments and various conditions without degradation.
- Non-Toxic to Fish and Plants - Specifically designed to be safe for all aquatic life, this silicone sealant is non-toxic, making it ideal for use in both freshwater and saltwater aquariums. It ensures that fish, plants, and other aquatic organisms remain healthy and unaffected by the sealant, promoting a thriving ecosystem.
- Resistant to Water, UV and Chemicals - Engineered to resist water, ultraviolet light, and many chemicals, this sealant delivers exceptional longevity and performance. It remains effective in various environmental conditions, including continuous underwater use and exposure to harsh sunlight, without losing its adhesive properties or flexibility.
- Rapid Curing with Atmospheric Moisture - This one-component sealant cures quickly upon exposure to atmospheric moisture, providing a fast and efficient bonding solution. Its rapid curing process ensures that the sealant sets quickly, allowing for immediate use and minimal downtime in both construction and repair projects
- Versatile Application for Various Surfaces - This versatile silicone sealant is suitable for a wide range of applications, including the construction and repair of aquariums, glazing on aluminum frames, shop displays, and sealing windows and doors. It adheres well to glass, aluminum, and many other surfaces, making it an essential tool for various sealing needs.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D6Z9MJBC |
| Best Sellers Rank | #245,096 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #430 in Silicone Adhesives |
| Brand | STANLEY |
| Brand Name | STANLEY |
| Color | Clear |
| Compatible Material | Glass |
| Container Type | Tube |
| Customer Reviews | 3.8 out of 5 stars 14 Reviews |
| Full Cure Time | 2 hours |
| Item Form | Liquid |
| Item Package Quantity | 2 |
| Manufacturer | StanleyChem |
| Material | Silicone |
| Material Type | Silicone |
| Model | S420 |
| Number of Pieces | 2 |
| Other Special Features of the Product | Fast Drying, Non Toxic, Waterproof |
| Part Number | SXSE1092US-AquarSlc |
| Special Feature | Fast Drying, Non Toxic, Waterproof |
| UPC | 810125469169 |
| Unit Count | 2 Count |
| Volume | 10.1 fluid ounces |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** STANLEY
- **Item Form:** Liquid
- **Material:** Silicone
- **Special Feature:** Fast Drying, Non Toxic, Waterproof
- **Specific Uses For Product:** Aquarium, Glazing, Shop Displays, Windows and Doors

## Images

![Stanley S420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack - Image 1](https://m.media-amazon.com/images/I/81dtxTN7jmL.jpg)
![Stanley S420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack - Image 2](https://m.media-amazon.com/images/I/71WkYxoqJLL.jpg)
![Stanley S420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack - Image 3](https://m.media-amazon.com/images/I/71SPEvOBxyL.jpg)
![Stanley S420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack - Image 4](https://m.media-amazon.com/images/I/81T09bsy-yL.jpg)
![Stanley S420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack - Image 5](https://m.media-amazon.com/images/I/812VZyC06jL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well
*by R***R on November 7, 2025*

Works great.

### ⭐⭐⭐⭐⭐ Good product
*by T***A on September 10, 2025*

Works well

### ⭐ Lacking quality for the namesake
*by A***A on January 16, 2026*

Did not hold at all! Had to redo project

## Frequently Bought Together

- Stanley Aquarium Silicone Sealant Clear - 1x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack.
- GREAT STUFF 99112849 Smart Dispenser Pond & Stone, 12 oz, Black

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-09-30*