---
product_id: 7622563
title: "K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz"
price: "฿2672"
currency: THB
in_stock: true
reviews_count: 8
url: https://www.desertcart.co.th/products/7622563-k-and-w-401016-block-seal-permanent-metallic-block-radiator
store_origin: TH
region: Thailand
---

# Withstands extreme pressure & temperature Universal for all water-cooled diesel & gasoline engines Permanent molecular steel-strong bond K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz

**Price:** ฿2672
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal it once, drive forever — the ultimate fix for fearless road warriors!

## Quick Answers

- **What is this?** K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz
- **How much does it cost?** ฿2672 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/7622563-k-and-w-401016-block-seal-permanent-metallic-block-radiator)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Steel-Strong Molecular Seal:** Creates an unbreakable bond that lasts a lifetime
- • **Professional Grade Reliability:** Exceeds ASTM D6107 standards for leak sealing excellence
- • **Versatile Engine Compatibility:** Seals cracks in cast iron, aluminum blocks, radiators & heater cores
- • **Extreme Pressure & Heat Resistance:** Performs flawlessly under the harshest cooling system conditions
- • **Trusted by Pros & Verified by Labs:** Independent testing ranks it #1 for permanent block & radiator repair

## Overview

K&W 401016 Block Seal Permanent Metallic™ is a professional-grade, 16 oz sealant that forms a permanent molecular bond as strong as steel. It effectively seals cracks and holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and radiators for all water-cooled diesel and gasoline vehicles. Engineered to withstand extreme pressure and temperature, it surpasses ASTM D6107 standards and is independently tested and rated #1 for cooling system leak repairs.

## Description

Forms a permanent molecular bond that's as strong as steel. Seals cracks & holes in cast iron & aluminum engine blocks, head gaskets, freeze plugs, & copper, aluminum & bi-material radiators & heater cores. Tested by an Independent test lab. Rated No.1

Review: Works great - Very good product
Review: Quality - Works as it should

## Features

- Permanent molecular seal that’s as strong as steel
- Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and copper, aluminum and bi-material radiators & heater cores
- For use in all water-cooled diesel and gasoline vehicles
- Withstands extreme pressure and temperatures of a cooling system and will not wash away
- Professional grade formula exceeds ASTM D6107 for effectively sealing leaks in cooling systems

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Customer Reviews | 4.1 out of 5 stars 378 Reviews |

## Images

![K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz - Image 1](https://m.media-amazon.com/images/I/719Ox96ysYL.jpg)

## Questions & Answers

**Q: How is this one different from another orange can with the same product title, also sold at Amazon?**
A: If you provide a link I would be happy to see if there is a difference. I do not find a single can listed with this same title. I see a 6 pack.

**Q: how about if you can’t take off thermostat.. cause my truck  Thermostat come with it 2005 Dodge ram 1500**
A: I didn’t take off my thermostat.  All I did was drain the existing coolant, fill it up with tap water half way then add the CRC bottle and then top off the water.  Drive it around for a week or two (500 miles). Check the radiator daily before you head out and if it does down fill it up with water.  After a week of driving you will notice that the water in the radiator will stop leaking (if it works).  Once it stops leaking for a couple of days then you can drain it again, flush it out with water then add in your coolant again.

**Q: can we pour it into the overflow reservoir?**
A: If I remember it's a big no on that. Take off the top hose of radiator and pour it in the hose. But you want to have room for it to flow into radiator. I think it was kinda thick so mix it with hot water then add to hose. That's my two cents.

**Q: will it stop water to oil leak?**
A: I don’t think so....think of it this way, the coolant has to leak into the combustion chamber for it to work.  The high heat will fuse the particle together at the crack and eventually plug up the leak.  You would have to leave it in your coolant for approx 500 miles.  That will give it time for this mixture to travel into your cylinder, heat up and plug up the leak.  Actually for me it only took about 200 miles and I noticed the water in the radiator stopped leaking (I check it every morning before driving out).

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great
*by G***E on September 11, 2025*

Very good product

### ⭐⭐⭐⭐⭐ Quality
*by B***N on January 2, 2026*

Works as it should

### ⭐⭐⭐⭐ Haven't used it yet, but know it works
*by A***A on January 19, 2026*

😄

## Frequently Bought Together

- CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz
- BlueDevil Products 00203 Radiator Flush & Oil Degreaser - 1 Quart
- K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology - 32 Fl Oz

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**Shop now:** [https://www.desertcart.co.th/products/7622563-k-and-w-401016-block-seal-permanent-metallic-block-radiator](https://www.desertcart.co.th/products/7622563-k-and-w-401016-block-seal-permanent-metallic-block-radiator)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-21*