---
product_id: 8120729
title: "ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon"
brand: "chimneyrx"
price: "VT25386"
currency: VUV
in_stock: true
reviews_count: 8
category: "Chimneyrx"
url: https://www.desertcart.vu/products/8120729-chimneyrx-300119-masonry-chimney-water-repellent-siloxane-based-non-film
store_origin: VU
region: Vanuatu
---

# Lasts up to 1 year Penetrates 1/4 inch deep Breathable, non-film barrier ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon

**Brand:** chimneyrx
**Price:** VT25386
**Availability:** ✅ In Stock

## Summary

> 🧱 Protect your chimney like a pro—waterproof without the weight!

## Quick Answers

- **What is this?** ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon by chimneyrx
- **How much does it cost?** VT25386 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/8120729-chimneyrx-300119-masonry-chimney-water-repellent-siloxane-based-non-film)

## 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

- • **Invisible Shield:** Transparent formula keeps your brick’s natural look intact
- • **Reliable Longevity:** Durable chemical bonds provide year-round protection you can trust
- • **Effortless Application:** Spray on easily with quick 2-coat process and simple soap cleanup
- • **Breathable Waterproofing:** Allows vapor escape to prevent freeze-thaw damage and spalling
- • **Deep Siloxane Penetration:** Seals masonry up to 1/4 inch for unmatched water defense

## Overview

ChimneyRx 300119 is a siloxane-based, breathable masonry water repellent that penetrates deeply into brick and concrete surfaces. It forms a transparent, non-film barrier that prevents water damage while allowing moisture vapor to escape, reducing freeze-thaw risks. Easy to apply with sprayers and quick drying, it covers 40 sq. ft. per gallon and offers durable protection lasting up to one year.

## Description

ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon - Fireplace Accessories - desertcart.com

Review: One year life span. - Works for 1 year. I sprayed it on my shingle roof it’s self along with my stone chimney.
Review: Ships fast and arrived in hood shape - Goes on easily. Too early to tell how it works , only been on for one day. Update: water doesn't bead up like it shows on the web sight. I question if it's going to do what it claims

## Features

- ADVANCED SILOXANE FORMULA: Siloxane masonry sealer deeply penetrates up to 1/4 inch into masonry and concrete, creating a strong, breathable water repellent barrier that provides lasting protection without altering the appearance of brick or stone
- BREATHABLE PROTECTION: Unlike film-forming sealers, ChimneyRx waterproof sealer allows water vapors to escape, preventing trapped moisture, which leads to spalling and scaling, while reducing the risk of freeze-thaw damage during colder months
- DURABLE & LONG LASTING: Our chimney waterproofing sealant forms strong chemical bonds beneath the surface, becoming a part of the physical structure, providing long-lasting protection against water damage to chimneys, ensuring years of defense
- EASY APPLICATION & CLEANUP: Apply the chimney sealer with a pump or airless sprayer; lay a drop cloth around the base, spray from the bottom up, and cover thoroughly; apply a second coat within 3-5 minutes; cleanup is easy with just soap and water
- DRY TIME & COVERAGE: This masonry sealant covers approximately 40 sq. ft. per gallon; apply in temperatures between 40-90°F, allow 2-6 hours drying time depending on humidity for optimal protection (apply at least 6 hours before rainfall)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0060BUZ9E |
| Additional Features | Waterproofing |
| Best Sellers Rank | #101,701 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #313 in Hardware Sealers |
| Brand | CHIMNEYRX |
| Brand Name | CHIMNEYRX |
| Controls Type | Push Button |
| Customer Reviews | 4.7 out of 5 stars 702 Reviews |
| Item Dimensions D x W x H | 4"D x 7"W x 12"H |
| Manufacturer | CHIMNEYRX |
| Material | concrete |
| Material Type | concrete |
| Mounting Type | Wall Mount |
| Product Dimensions | 4"D x 7"W x 12"H |
| Special Feature | Waterproofing |
| Specification Met | rx |
| UPC | 709057221283 |
| Vent Hood Design | Wall Mounted Canopy Hood |
| Ventilation Type | Ductless/Recirculating |

## Product Details

- **Brand:** CHIMNEYRX
- **Material:** concrete
- **Mounting Type:** Wall Mount
- **Product Dimensions:** 4"D x 7"W x 12"H
- **Special Feature:** Waterproofing

## Images

![ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon - Image 1](https://m.media-amazon.com/images/I/61Ca-L4xA2L.jpg)

## Questions & Answers

**Q: Can I use this to seal the top of my chimney?**
A: This product is for sealing bricks which is fine for the brick part of the chimney. For the crown you should use this product; http://www.amazon.com/ChimneyRx-Brushable-Masonry-Fireplace-Repair/dp/B004XJYJBA/ref=sr_1_1?s=hi&ie=UTF8&qid=1459433037&sr=1-1&keywords=ChimneyRx+Brushable+Masonry+Fireplace+Crown+Repair

**Q: is this product made by system savers in richmond indiana?**
A: Yes it is!!!

**Q: It says vertical surfaces.  I wonder if I can use it on our brick front stoop and steps?**
A: It works on vertical and horizontal surfaces but is designed to shed water from vertical surfaces better and won't protect from standing water on horizontal surfaces.

**Q: Is this available in larger quantities ?**
A: No, it is not available in larger quantities.

## Customer Reviews

### ⭐⭐⭐⭐⭐ One year life span.
*by J***. on October 16, 2025*

Works for 1 year. I sprayed it on my shingle roof it’s self along with my stone chimney.

### ⭐⭐⭐⭐⭐ Ships fast and arrived in hood shape
*by B***R on October 5, 2025*

Goes on easily. Too early to tell how it works , only been on for one day. Update: water doesn't bead up like it shows on the web sight. I question if it's going to do what it claims

### ⭐⭐⭐⭐⭐ Fireplace water leak eliminated
*by B***T on July 1, 2025*

I patched every place I could see with Mortar sealant and I still had a leak. So, this product worked in stopping the leak. I purchased a new pump-up spray jug and sprayed down the chimney and we had a small shower and No leaks, the next day it rained almost 2 inches and "NO LEAKS". Hip-Hip Hooray. Note: I was told it might change the color the bricks, so I did the entire wall along with fireplace, and unless you're an expert - I can't tell it did anything.

## Frequently Bought Together

- ChimneyRx 300119 Masonry Chimney Water Repellent - Siloxane Based, Non-Film-Forming, Breathable, and Transparent Waterproof Coating for Brick Chimneys & Other Vertical Surfaces - 1 Gallon
- ChimneyRx 300014 Brushable Chimney Crown Repair – Elastomeric & Waterproof Coating for Crowns & Masonry - Fast-Setting & Long-Lasting Protection Crack & Leak Prevention - 1 Gallon

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-06*