---
product_id: 238713604
title: "Chimney Flashing Sealer - Flexible Chimney Sealant Protects Against Water Leaks - 2.2 kg"
brand: "masonrydefender"
price: "$145.42"
currency: USD
in_stock: true
reviews_count: 8
category: "Masonry Defender"
url: https://www.desertcart.us/products/238713604-chimney-flashing-sealer-flexible-chimney-sealant-protects-against-water-leaks
store_origin: US
region: United States of America
---

# Easy brush-on application Waterproof barrier Flexible & durable seal Chimney Flashing Sealer - Flexible Chimney Sealant Protects Against Water Leaks - 2.2 kg

**Brand:** masonrydefender
**Price:** $145.42
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal smart, stay dry — protect your home like a pro!

## Quick Answers

- **What is this?** Chimney Flashing Sealer - Flexible Chimney Sealant Protects Against Water Leaks - 2.2 kg by masonrydefender
- **How much does it cost?** $145.42 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/238713604-chimney-flashing-sealer-flexible-chimney-sealant-protects-against-water-leaks)

## Best For

- masonrydefender enthusiasts

## Why This Product

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

## Key Features

- • **Flex & Resist:** Maintains flexibility without cracking or chipping for long-lasting protection.
- • **Broad Coverage:** Covers up to 14 sq. ft. per 2.2 kg container, perfect for chimney and roof flashing.
- • **Trusted Weather Shield:** Proven to withstand heavy rain and harsh weather, protecting your home’s foundation.
- • **Fast & Simple Application:** Brush-on formula dries tough like oil-based but cleans up with water.
- • **Ultimate Waterproof Defense:** Seals chimney flashings to block water penetration at critical roof junctions.

## Overview

MasonryDefender Chimney Flashing Sealer is a flexible, durable, and easy-to-apply waterproof sealant designed to protect chimney flashings and rooflines from water leaks. With a black finish covering up to 14 sq. ft. per 2.2 kg container, it resists cracking and weather damage, ensuring long-term protection against water intrusion and structural damage.

## Description

MasonryDefender Chimney Flashing Sealer - Flexible Chimney Sealant Protects Against Water Leaks - 2.2 kg - desertcart.com

Review: SO FAR SO GOOD - This stuff seems phenomenal , I applied it [ Colorado ] we have had a very wet 2023 Summer , now it [ October ] seems like a drought again . Go figure ... however after EVERY storm this year [ by the way , I did the flashing on my chimney ] it has been soaked and getting to my cinder block foundation . This is not good . Anyway , after this last heavy rain , I looked , behind fireplace ... perfecto ! This stuff sealed my chimney base , so far so good and it applies very easily . The application is VERY easy , it is water based , dries like oil based , that is seems strong , not lingering wet . By the way , other reviews say the paint brush is shot afterwards , not if you wash it pretty soon after application , it is acrylic , so it washes away . Mine did ... so far so good , we will see next Spring . I think it's a winner Thanks
Review: Much better than expected - I expected this to put a thin layer of protection over the metal on the chimney flashing, but it was far thicker and easier to apply than I imagined. It was able to fill in all the little gaps easily, and the finished cured coating seems tough, flexible, and thick enough to withstand the weather. I could not be happier, really.

## Features

- SEALS CHIMNEY FLASHINGS: Creates a waterproof barrier to stop water penetration where chimney meets roof line. Ideal for chimney flashing and roof flashing sealant needs.
- FLEXIBLE LONG-LASTING SEAL: Won't crack or chip. This chimney sealer stays flexible over time and resists becoming brittle, ensuring durable protection for years.
- PREVENTS CHIMNEY LEAKS: Helps prevent leaks at the roofline by sealing vulnerable areas fast. Use as a chimney waterproofing sealant to protect your home from water damage.
- EASY APPLICATION PROCESS: Simple to apply with a paint brush. Just paint the chimney flashing sealer around the base for long-lasting, weather-resistant coverage.
- BLACK FINISH & COVERAGE: Available in black and covers up to 14 sq. ft. per half gallon container. Perfect for chimney roof flashing and masonry surfaces.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08F832CKL |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #167,084 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #389 in Hardware Sealers |
| Customer Reviews | 4.6 4.6 out of 5 stars (135) |
| Date First Available | August 4, 2020 |
| Item Weight | 4.91 pounds |
| Manufacturer | SaverSystems |
| Package Dimensions | 6.85 x 6.54 x 5.12 inches |

## Images

![Chimney Flashing Sealer - Flexible Chimney Sealant Protects Against Water Leaks - 2.2 kg - Image 1](https://m.media-amazon.com/images/I/410KkktEjJL.jpg)
![Chimney Flashing Sealer - Flexible Chimney Sealant Protects Against Water Leaks - 2.2 kg - Image 2](https://m.media-amazon.com/images/I/41GdK0osJ7L.jpg)
![Chimney Flashing Sealer - Flexible Chimney Sealant Protects Against Water Leaks - 2.2 kg - Image 3](https://m.media-amazon.com/images/I/516gs0Z-GML.jpg)
![Chimney Flashing Sealer - Flexible Chimney Sealant Protects Against Water Leaks - 2.2 kg - Image 4](https://m.media-amazon.com/images/I/516ow6-eG6L.jpg)
![Chimney Flashing Sealer - Flexible Chimney Sealant Protects Against Water Leaks - 2.2 kg - Image 5](https://m.media-amazon.com/images/I/51NV2ipNy+L.jpg)

## Questions & Answers

**Q: Should you use fabric reinforcement tape with this? Like is recommended with FlashSeal?**
A: Are you talking about the mesh material. First cut your pieces or have a pair of scissors I find her easier to use. Get a cheap paint brush take your time paint above flashing onto the brick above the flashing and lay the mesh over. You got about 10-20 seconds to play with it …after that she gets hard to work with, and you’ll make it look worse. If you need to do a second coat wait until it dries then go back and put a second coat. If you try to go back and add more before it’s dry you’ll just mess it up. 
This is the type of information it takes years to acquire through trial and error. if you don’t do it right, it’s a pain to remove  and then you’re really getting into a sticky situation.

So recap. Depending on the size of the chimney, and I would do med/ large sections at a time. I have your pieces ready put your first coat on lay you mesh pieces and make sure you put your second coat thick enough that  you can’t see the mesh.

## Customer Reviews

### ⭐⭐⭐⭐⭐ SO FAR SO GOOD
*by M***K on October 11, 2023*

This stuff seems phenomenal , I applied it [ Colorado ] we have had a very wet 2023 Summer , now it [ October ] seems like a drought again . Go figure ... however after EVERY storm this year [ by the way , I did the flashing on my chimney ] it has been soaked and getting to my cinder block foundation . This is not good . Anyway , after this last heavy rain , I looked , behind fireplace ... perfecto ! This stuff sealed my chimney base , so far so good and it applies very easily . The application is VERY easy , it is water based , dries like oil based , that is seems strong , not lingering wet . By the way , other reviews say the paint brush is shot afterwards , not if you wash it pretty soon after application , it is acrylic , so it washes away . Mine did ... so far so good , we will see next Spring . I think it's a winner Thanks

### ⭐⭐⭐⭐⭐ Much better than expected
*by F***T on August 11, 2025*

I expected this to put a thin layer of protection over the metal on the chimney flashing, but it was far thicker and easier to apply than I imagined. It was able to fill in all the little gaps easily, and the finished cured coating seems tough, flexible, and thick enough to withstand the weather. I could not be happier, really.

### ⭐⭐⭐⭐⭐ Chimney sealer
*by N***R on May 26, 2025*

I thought this product to be on the pricey side but I had a leak around my chimney for a few years and tried just about anything Home Depot had to offer. Not only fixed my leak, It worked on my leaks I had on my metal roof as well.

## Frequently Bought Together

- MasonryDefender Chimney Flashing Sealer - Flexible Coating That Protects Chimney Flashings from Water Leaks
- MasonryDefender Chimney Crown Sealer - Brushable Sealant Fixes Cracked Chimney Tops & Prevents Chimney Leaks
- MasonryDefender Chimney Brick Sealer, Clear Water-Based Siloxane Sealer - Breathable Waterproofer for All Exterior, Vertical Masonry Surfaces - 1 Gal

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-01-26*