---
product_id: 20828133
title: "NOS Silver Seal Radiator Sealer Stop Leak Powder NOS - 21 g"
brand: "westco"
price: "€ 0.52"
currency: EUR
in_stock: false
reviews_count: 8
url: https://www.desertcart.fi/products/20828133-nos-silver-seal-radiator-sealer-stop-leak-powder-nos-21
store_origin: FI
region: Finland
---

# Prevents engine overheating Stops leaks fast Anti-rust protection NOS Silver Seal Radiator Sealer Stop Leak Powder NOS - 21 g

**Brand:** westco
**Price:** € 0.52
**Availability:** ❌ Out of Stock

## Summary

> 🛠️ Seal the deal, skip the repair bills!

## Quick Answers

- **What is this?** NOS Silver Seal Radiator Sealer Stop Leak Powder NOS - 21 g by westco
- **How much does it cost?** € 0.52 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/20828133-nos-silver-seal-radiator-sealer-stop-leak-powder-nos-21)

## Best For

- westco enthusiasts

## Why This Product

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

## Key Features

- • **Rust-Free Ride:** Protects your cooling system with a powerful anti-rust agent for long-lasting durability.
- • **Easy Application:** Just dilute and pour—works with any antifreeze type for hassle-free maintenance.
- • **Overheat No More:** Prevents costly engine overheating by chemically sealing cooling system leaks.
- • **Pump Squeak Silencer:** Lubricates water pump chemically to stop annoying squeaks and extend pump life.
- • **Leak-Proof Confidence:** Seals radiator cracks instantly to keep your engine cool and running smoothly.

## Overview

NOS Silver Seal Radiator Sealer Stop Leak Powder (21g) is a compact, silicone-based additive designed to instantly seal radiator leaks, prevent engine overheating, and protect against rust. Compatible with all antifreeze types, it circulates through the cooling system to chemically lubricate water pumps and seal cracks, offering an affordable, easy-to-use solution for vehicle maintenance.

## Description

Directions for use silver seal stop leak: Dilute 1 dose in 20 cl of coolant Pour into the radiator or expansion vessel Level the coolant Allow the engine 15 minutes of operation with the heater in maximum position

Review: worked great - sealed my radiator up fast
Review: Stopped a Leak! - So far this product has been a wonderful blessing. Had a leak in an '01 F-150 coming from the manifold around a hose fitting. Used the Silver Seal and stopped the leak. Estimates were $500.00 to $1200.00. The SS was $10.00! Still checking the heat gauges and radiator level but so far so good. Follow directions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000AME522 |
| ASIN  | B000AME522 |
| Brand | Westco |
| Color | Silver |
| Customer Reviews | 3.6 3.6 out of 5 stars (24) |
| Date First Available | March 10, 2014 |
| Date First Available  | March 10, 2014 |
| Is Discontinued By Manufacturer | No |
| Is Discontinued By Manufacturer  | No |
| Item Form | Powder |
| Item Weight | 0.741 ounces |
| Material | Silicone |
| Package Dimensions | 2.8 x 1.6 x 1.1 inches |
| Package Dimensions  | 2.8 x 1.6 x 1.1 inches; 0.74 ounces |
| Style | Compact |
| UPC | 052284019902 |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Westco
- **Item Weight:** 21 Grams
- **Material:** Silicone
- **Style:** Compact
- **Water Resistance Level:** Water Resistant

## Images

![NOS Silver Seal Radiator Sealer Stop Leak Powder NOS - 21 g - Image 1](https://m.media-amazon.com/images/I/51wu8AvxlcL.jpg)
![NOS Silver Seal Radiator Sealer Stop Leak Powder NOS - 21 g - Image 2](https://m.media-amazon.com/images/I/614q6cyWNkL.jpg)

## Questions & Answers

**Q: Is this meatallic flakes?**
A: Its more like a silver powder

**Q: Instructions how to do it**
A: I didn’t  have access to my radiator so I drained some, took off my upper hose, reclamped, topped off coolant and ran til hot and thermostat opened. Unfortunately my leak was to big and had to do repairs

**Q: why is vehicle still heating up**
A: radiator blocked up? has to be done very thoroughly according to instructions.

**Q: How do open it? Do i put  directly in thr radiator?**
A: I cut the top off and pour directlt into radiator  with clean water and then run the heck out out of it

## Customer Reviews

### ⭐⭐⭐⭐ worked great
*by F***B on August 15, 2019*

sealed my radiator up fast

### ⭐⭐⭐⭐⭐ Stopped a Leak!
*by J***Y on September 23, 2019*

So far this product has been a wonderful blessing. Had a leak in an '01 F-150 coming from the manifold around a hose fitting. Used the Silver Seal and stopped the leak. Estimates were $500.00 to $1200.00. The SS was $10.00! Still checking the heat gauges and radiator level but so far so good. Follow directions.

### ⭐⭐⭐⭐⭐ real deal
*by R***R on December 13, 2019*

NEW old stock, had not seen this for a very long time.

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**Shop now:** [https://www.desertcart.fi/products/20828133-nos-silver-seal-radiator-sealer-stop-leak-powder-nos-21](https://www.desertcart.fi/products/20828133-nos-silver-seal-radiator-sealer-stop-leak-powder-nos-21)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-10*