---
product_id: 294140587
title: "Red Devil 0841DX F Seal 181 Water Based Duct Sealant, 1 gallon, Gray"
brand: "red devil"
price: "S$246"
currency: SGD
in_stock: false
reviews_count: 5
category: "Red Devil"
url: https://www.desertcart.sg/products/294140587-red-devil-0841dx-f-seal-181-water-based-duct-sealant
store_origin: SG
region: Singapore
---

# Fast-drying, low VOC formula Weather-resistant for indoor/outdoor use UL 181 A-M & B-M certified Red Devil 0841DX F Seal 181 Water Based Duct Sealant, 1 gallon, Gray

**Brand:** red devil
**Price:** S$246
**Availability:** ❌ Out of Stock

## Summary

> 🔧 Seal smart, save energy, and stay ahead with Red Devil F-Seal 181!

## Quick Answers

- **What is this?** Red Devil 0841DX F Seal 181 Water Based Duct Sealant, 1 gallon, Gray by red devil
- **How much does it cost?** S$246 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/294140587-red-devil-0841dx-f-seal-181-water-based-duct-sealant)

## Best For

- red devil enthusiasts

## Why This Product

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

## Key Features

- • **Fast & Safe Application:** Low VOC, quick-dry formula means less downtime and healthier environments.
- • **Leak-Proof HVAC Mastery:** Fiber-reinforced formula guarantees airtight, energy-saving duct seals.
- • **Industry-Leading Standards:** Exceeds SMACNA pressure classes for professional-grade reliability.
- • **Built to Brave the Elements:** Weatherproof durability ensures lasting performance indoors and out.
- • **Universal Duct Compatibility:** Certified for metal, fiberglass, and flexible ducts—one sealant to rule them all.

## Overview

Red Devil 0841DX F Seal 181 is a premium, fiber-reinforced, water-based duct sealant designed for superior HVAC sealing. UL 181 A-M & B-M certified, it works on metal, fiberglass, and flexible ducts. Its fast-drying, low VOC formula ensures quick, safe application, while its weather-resistant properties make it ideal for both indoor and outdoor use. Exceeding SMACNA pressure and sealing standards, this USA-made sealant delivers durable, energy-efficient performance trusted by professionals.

## Description

Red Devil F-Seal 181 is a premium fiber-reinforced water-based duct sealant engineered for superior performance in all HVAC systems. This versatile sealant is UL 181 A-M & B-M certified, making it suitable for metal, fiberglass, and flexible ducts. Its fast-drying, low VOC formula ensures quick application and safety in sensitive environments. F-Seal 181 exceeds all SMACNA Pressure and Sealing Classes, providing unmatched sealing capabilities for high, medium, and low-pressure HVAC systems. The durable, weather-resistant formula is perfect for both indoor and outdoor use, resisting mold, mildew, and UV damage. It contributes to LEED EQ Credit 4.1 and meets CA Dept. of Public Health Emission Requirements V1.1, 2011. This USA-made product offers excellent adhesion, flexibility, and can be painted after full cure. For best results, apply in temperatures between 40°F and 110°F, allowing 24-72 hours drying time before pressure testing. F-Seal 181 is your go-to solution for efficient, long-lasting HVAC duct sealing.

Review: Works great
Review: Good for all around applications

## Features

- SUPERIOR SEALING: Fiber-reinforced formula ensures leak-free HVAC systems, improving energy efficiency and performance
- VERSATILE APPLICATION: UL 181 A-M & B-M certified for use on all types of HVAC ductwork, including metal, fiberglass, and flexible ducts
- INDOOR/OUTDOOR DURABILITY: Weather-resistant sealant withstands various conditions, making it ideal for both interior and exterior use
- FAST-DRYING & LOW VOC: Quick application and reduced drying time, with low volatile organic compounds for safer use in sensitive environments
- EXCEEDS INDUSTRY STANDARDS: Surpasses all SMACNA Pressure and Sealing Classes, ensuring top-quality performance for your HVAC systems

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01I7JVUO0 |
| Best Sellers Rank | #271,126 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,044 in Hardware Sealers |
| Brand | Red Devil |
| Brand Name | Red Devil |
| Colour | Gray,Red |
| Compatible Material | Fibreglass, Metal, Plastic |
| Country of Publication | USA |
| Customer Reviews | 4.4 out of 5 stars 1,223 Reviews |
| Global Trade Identification Number | 00075339003466 |
| Included Components | Duct Sealant |
| Item Dimensions | 17.8 x 17.8 x 20.3 Centimeters |
| Item Form | Paste |
| Item Type Name | Water Based Duct Sealant, 1 Gallon |
| Item Weight | 454 g |
| Item dimensions L x W x H | 17.8 x 17.8 x 20.3 Centimeters |
| Manufacturer | Red Devil |
| Material | Acrylic |
| Material Type | Acrylic |
| Style | 1 - Pack |
| Style Name | 1 - Pack |
| Supported Standards | UL 181 a-m, UL 181 b-m |
| Surface Recommendation | Metal |
| UPC | 075339003466 |
| Unit Count | 128.0 Milliliters |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Red Devil
- **Item Weight:** 1 Pounds
- **Item dimensions L x W x H:** 17.8 x 17.8 x 20.3 Centimeters
- **Material:** Acrylic
- **Style:** 1 - Pack

## Images

![Red Devil 0841DX F Seal 181 Water Based Duct Sealant, 1 gallon, Gray - Image 1](https://m.media-amazon.com/images/I/61DR9w5x7fL.jpg)
![Red Devil 0841DX F Seal 181 Water Based Duct Sealant, 1 gallon, Gray - Image 2](https://m.media-amazon.com/images/I/61g4OiMBuXL.jpg)
![Red Devil 0841DX F Seal 181 Water Based Duct Sealant, 1 gallon, Gray - Image 3](https://m.media-amazon.com/images/I/61wXviPRg2L.jpg)
![Red Devil 0841DX F Seal 181 Water Based Duct Sealant, 1 gallon, Gray - Image 4](https://m.media-amazon.com/images/I/718Qkc+7HiL.jpg)
![Red Devil 0841DX F Seal 181 Water Based Duct Sealant, 1 gallon, Gray - Image 5](https://m.media-amazon.com/images/I/71BJyuDkMZL.jpg)

## Questions & Answers

**Q: Is the "F" in the bucket like a liquid (brushable) or more like a paste?**
A: It's not quite like a paste but it's not liquidity either and doesn't drip so you can put it on thick.  I love this stuff, not much of a odor as well. I used a cheap chip brush to spread it.

**Q: I'm redoing all the flex ductwork (insulated kind) in a crawl space. should i use the d our f sealant ?**
A: You could use either one.  Both are perfect for what you are doing, but I would use the F-Seal because it has fibers in it.

**Q: Is this safe to use and will it work on gas dryer duct work joints (inside the fittings and outside)?**
A: Sorry, this should not be used on a dryer. It is for HVAC only. Thanks.

**Q: How long do I need to wait before turning on the A/C after application?**
A: Hi, you should wait 24 hours. Thanks....

## Customer Reviews

### ⭐⭐⭐⭐ Works great
*by H***. on 26 July 2020*



### ⭐⭐⭐⭐ Good for all around applications
*by S***G on 2 October 2020*



### ⭐⭐⭐⭐⭐ great buy
*by J***T on 11 March 2025*



## Frequently Bought Together

- Red Devil 0841DX F-Seal 181 Fiber Reinforced Water Based Duct Sealant, 1 Gallon, Gray, Made in USA
- Pro Grade - Chip Paint Brushes - 12 Ea 2 Inch Chip Paint Brush Light Brown

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.sg/products/294140587-red-devil-0841dx-f-seal-181-water-based-duct-sealant](https://www.desertcart.sg/products/294140587-red-devil-0841dx-f-seal-181-water-based-duct-sealant)

---

*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-12*