---
product_id: 99488507
title: "Products - Cooling System Sealer - 16 oz."
brand: "hapco"
price: "€ 99.50"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.hr/products/99488507-products-cooling-system-sealer-16-oz
store_origin: HR
region: Croatia
---

# Water-resistant, permanent seal Polymer-based, metal-compatible 16 oz fast-acting formula Products - Cooling System Sealer - 16 oz.

**Brand:** hapco
**Price:** € 99.50
**Availability:** ✅ In Stock

## Summary

> ❄️ Seal the deal on leaks before they seal your fate!

## Quick Answers

- **What is this?** Products - Cooling System Sealer - 16 oz. by hapco
- **How much does it cost?** € 99.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/99488507-products-cooling-system-sealer-16-oz)

## Best For

- hapco enthusiasts

## Why This Product

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

## Key Features

- • **Rapid Leak Repair:** Seals head gasket, heater core, freeze plug, block & radiator leaks in no time
- • **Safe & Clean Formula:** No harmful metal flakes—protects your engine without compromise
- • **Guaranteed Durability:** Permanent cooling system repair backed by trusted Hapco quality
- • **Effortless Application:** Easy-to-use liquid form designed for quick, permanent fixes
- • **Universal Compatibility:** Mixes seamlessly with all antifreeze types for hassle-free use

## Overview

Hapco's 16 oz Cooling System Sealer is a polymer-based, water-resistant liquid designed to permanently repair leaks in head gaskets, heater cores, freeze plugs, blocks, and radiators. Compatible with all antifreeze types and free from harmful metal flakes, it offers a fast, easy, and guaranteed solution to keep your cooling system running flawlessly.

## Description

Products - Cooling System Sealer - 16 oz.

## Features

- Use for head gasket, heater core, freeze plug, block and radiator leaks
- Mixes with all types of antifreeze
- Does not contain any harmful metal flakes
- Works fast and is easy to use
- Permanent cooling system repair – Guaranteed

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Polymer-based |
| Brand | Hapco |
| Item Weight | 16 Ounces |
| Compatible Material | Metal |
| Water Resistance Level | Water Resistant |
| Item Form | Liquid |
| UPC | 782709005165 |
| Unit Count | 16 Fl Oz |
| Style | Compact |
| Manufacturer | Hapco Products Co. |
| Item Weight | 1 pounds |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 516 |

## Product Details

- **Material:** Polymer-based
- **Brand:** Hapco
- **Item Weight:** 16 Ounces
- **Compatible Material:** Metal
- **Water Resistance Level:** Water Resistant

## Images

![Products - Cooling System Sealer - 16 oz. - Image 1](https://m.media-amazon.com/images/I/813Db8qEWwL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ I AM AMAZED
*by D***C on June 30, 2022*

I couldn't see where the water leak was coming from but it was a consistent leak. I decided to give this Hapco Cooling System Sealer a try after trying many other brands from the auto parts store. It took a lot longer than the product instructions suggested for the leak to completely stop. Initially, the product slowed the leak but after driving for a while, it completely stop. I would highly recommend this product for cooling system leaks.

### ⭐⭐⭐ Not a Fix all Product
*by L***E on June 8, 2021*

My 2003 Ford F-150 was diagnosed with a blown Head Gasket. I figured i Would give this product a tryNo change still have a misfire on cylinder 3 and Cylinder 4. Hey it was worth a shot.

### ⭐⭐ Didn't work/ can't return
*by R***R on October 20, 2022*

Pretty unhappy with this product and the company that makes it.Product didn't work on tiny leak and "money back" statement on bottle and webpage not honored by the company that makes it.

## Frequently Bought Together

- Hapco Products - Cooling System Sealer - 16 oz.
- Hapco Products - Pro-Seal (Pack of 2)

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**Shop now:** [https://www.desertcart.hr/products/99488507-products-cooling-system-sealer-16-oz](https://www.desertcart.hr/products/99488507-products-cooling-system-sealer-16-oz)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-07*