---
product_id: 18312923
title: "300054 Brushable Chimney Flashing Repair Sealant – Black Elastomeric Waterproof Coating Leak Protection for Chimneys, Vents & Skylights - Bonds to Shingles, Bricks, & More - 1/2 Gallon"
brand: "chimneyrx"
price: "€ 105.76"
currency: EUR
in_stock: true
reviews_count: 9
category: "Chimneyrx"
url: https://www.desertcart.ie/products/18312923-300054-brushable-chimney-flashing-repair-sealant-black-elastomeric-waterproof-coating
store_origin: IE
region: Ireland
---

# Dries in 12 hours Elastomeric waterproof barrier Bonds to multiple roofing surfaces 300054 Brushable Chimney Flashing Repair Sealant – Black Elastomeric Waterproof Coating Leak Protection for Chimneys, Vents & Skylights - Bonds to Shingles, Bricks, & More - 1/2 Gallon

**Brand:** chimneyrx
**Price:** € 105.76
**Availability:** ✅ In Stock

## Summary

> 💧 Seal smart, stay dry—your chimney’s new best friend!

## Quick Answers

- **What is this?** 300054 Brushable Chimney Flashing Repair Sealant – Black Elastomeric Waterproof Coating Leak Protection for Chimneys, Vents & Skylights - Bonds to Shingles, Bricks, & More - 1/2 Gallon by chimneyrx
- **How much does it cost?** € 105.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/18312923-300054-brushable-chimney-flashing-repair-sealant-black-elastomeric-waterproof-coating)

## Best For

- chimneyrx enthusiasts

## Why This Product

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

## Key Features

- • **Coverage That Counts:** Half-gallon covers up to 14 sq ft—seal every inch with confidence.
- • **Quick-Dry Efficiency:** Fully cures in just 12 hours for fast, reliable repairs.
- • **Flexible Leak Defense:** Elastomeric formula stays pliable—no cracks, no leaks.
- • **Effortless Application:** Brush-on sealant with easy soap-and-water cleanup.
- • **Universal Surface Bonding:** Adheres permanently to shingles, brick, aluminum & more.

## Overview

Black Elastomeric Flashing Sealant is a durable, flexible waterproof coating designed to prevent leaks around chimneys, vents, and skylights. Its elastomeric formula resists cracking over time and bonds securely to multiple roofing materials including asphalt shingles, aluminum flashing, and brick. Easy to apply with a brush and quick to dry within 12 hours, this half-gallon sealant covers approximately 14 square feet, providing a long-lasting, weather-resistant barrier that keeps your home protected from water damage.

## Description

desertcart.com: ChimneyRx 300054 Brushable Chimney Flashing Repair Sealant – Black Elastomeric Waterproof Coating Leak Protection for Chimneys, Vents & Skylights - Bonds to Shingles, Bricks, & More - 1/2 Gallon : Industrial & Scientific

Review: Great Product to Solve/Prevent Leaks Around Chimney Flashing - I really like this product! I like to maintain the flashing around my masonry chimney and I've always done it with a dab of some product here and there, but it is easy to miss an area that might have a gap if it is small. Last year we had an 11" rain here in WI and sure enough, just a small amount of water did leak in around the chimney. With this product you "paint" it over the entire flashing and where it meets the roof and the brick, so there are no missed areas - the entire thing is coated. The product applied quite easily - it's is fairly thick, but it did go on and brush out with a regular paint brush. I followed the instructions and masked the roof and the brick with duct tape and then applied the product. Once done, just remove the tape and you have an amazing looking job! In the on-line instructions the coverage is listed at 14 - 18 sq ft at a thickness of 1/8" for the 1 gallon size. In the desertcart listing it is listed as 12 sq ft, but the product is only 1/2 gallon, so that is not correct. I did 10 sq ft and used about half of the 1/2 gallon container. I would think I must have applied it about 1/16" thick. It is very hard to get an exact thickness when you are applying it.
Review: Stopped the leak - I was a bit concerned when I opened the shipping box and saw that the lid of the plastic tub had leaked a bit, as though the lid may have popped from pressure during shipping. Sealer seemed ok. We assumed that our interior ceiling leak was from the chimney flashing. The sealer was brushed liberally around and on the flashing. The next 5 days we had heavy downpours. No interior ceiling leaks. Very pleased.

## Features

- ELASTOMERIC WATERPROOF SEALANT: Seals chimney flashing with a durable, flexible barrier; this chimney sealant prevents leaks around chimneys, stacks, vents, and skylights, providing protection against water and harsh weather
- STAYS FLEXIBLE, WON'T CRACK: Unlike tar-based sealants, this chimney repair sealer has an elastomeric formula that stays pliable over time, resisting brittleness and cracking that can cause leaks; it requires no mixing or special bonding agents
- BONDS TO MULTIPLE SURFACES: This waterproofing sealant adheres permanently to asphalt shingles, aluminum flashing, brick, and other roofing materials for a secure, long-lasting seal
- EASY APPLICATION & CLEANUP: Our chimney flashing sealant applies easily with a brush (not included), making repairs quick and simple; cleanup is hassle-free with just soap and water, saving you time and effort
- DRY TIME & COVERAGE: This waterproof coating sealant dries in 12 hours under dry weather conditions, with a temperature range of 45-90°F; each 1/2-gallon plastic container covers approximately 14 square feet

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0060NKMOU |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #167,783 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #198 in Industrial Coatings |
| Brand | CHIMNEYRX |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (285) |
| Date First Available | October 28, 2011 |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Weight | 5.15 pounds |
| Item dimensions L x W x H | 12 x 12 x 12 inches |
| Item model number | BHBUKPPAZINH2401 |
| Manufacturer | SaverSystems |
| Material | Plastic |
| Number Of Pieces | 1 |
| Number of Items | 1 |
| Part Number | 300054 |
| Product Dimensions | 12 x 12 x 12 inches |
| Size | 1/2 Gallon |
| Surface Recommendation | Aluminum Flashing, Asphalt Shingles, Brick |
| UPC | 709057942645 709057941648 |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** CHIMNEYRX
- **Item Form:** Liquid
- **Item dimensions L x W x H:** 12 x 12 x 12 inches
- **Material:** Plastic
- **Water Resistance Level:** Water Resistant

## Images

![300054 Brushable Chimney Flashing Repair Sealant – Black Elastomeric Waterproof Coating Leak Protection for Chimneys, Vents & Skylights - Bonds to Shingles, Bricks, & More - 1/2 Gallon - Image 1](https://m.media-amazon.com/images/I/81+13WKLBRL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Product to Solve/Prevent Leaks Around Chimney Flashing
*by T***R on August 17, 2019*

I really like this product! I like to maintain the flashing around my masonry chimney and I've always done it with a dab of some product here and there, but it is easy to miss an area that might have a gap if it is small. Last year we had an 11" rain here in WI and sure enough, just a small amount of water did leak in around the chimney. With this product you "paint" it over the entire flashing and where it meets the roof and the brick, so there are no missed areas - the entire thing is coated. The product applied quite easily - it's is fairly thick, but it did go on and brush out with a regular paint brush. I followed the instructions and masked the roof and the brick with duct tape and then applied the product. Once done, just remove the tape and you have an amazing looking job! In the on-line instructions the coverage is listed at 14 - 18 sq ft at a thickness of 1/8" for the 1 gallon size. In the Amazon listing it is listed as 12 sq ft, but the product is only 1/2 gallon, so that is not correct. I did 10 sq ft and used about half of the 1/2 gallon container. I would think I must have applied it about 1/16" thick. It is very hard to get an exact thickness when you are applying it.

### ⭐⭐⭐⭐⭐ Stopped the leak
*by E***A on June 2, 2023*

I was a bit concerned when I opened the shipping box and saw that the lid of the plastic tub had leaked a bit, as though the lid may have popped from pressure during shipping. Sealer seemed ok. We assumed that our interior ceiling leak was from the chimney flashing. The sealer was brushed liberally around and on the flashing. The next 5 days we had heavy downpours. No interior ceiling leaks. Very pleased.

### ⭐⭐⭐⭐ Exactly as advertised.
*by C***. on April 17, 2015*

Easy to apply. So far after several rains it seems to be working great.Took about an hour to apply. Easy cleanup with soap and water.

## Frequently Bought Together

- ChimneyRx 300054 Brushable Chimney Flashing Repair Sealant – Black Elastomeric Waterproof Coating Leak Protection for Chimneys, Vents & Skylights - Bonds to Shingles, Bricks, & More - 1/2 Gallon
- ChimneyRx 300014 Brushable Chimney Crown Repair – Elastomeric & Waterproof Coating for Crowns & Masonry - Fast-Setting & Long-Lasting Protection Crack & Leak Prevention - 1 Gallon
- ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-19*