Is the "F" in the bucket like a liquid (brushable) or more like a paste?

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.

I'm redoing all the flex ductwork (insulated kind) in a crawl space. should i use the d our f sealant ?

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.

Is this safe to use and will it work on gas dryer duct work joints (inside the fittings and outside)?

Sorry, this should not be used on a dryer. It is for HVAC only. Thanks.

How long do I need to wait before turning on the A/C after application?

Hi, you should wait 24 hours. Thanks....

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Red Devil 0841DX F-Seal 181 Fiber Reinforced Water Based Duct Sealant, 1 Gallon, Gray

Red Devil 0841DX F-Seal 181 Fiber Reinforced Water Based Duct Sealant, 1 Gallon, Gray

Product ID: 303805407

Details

Brand
Red Devil
Item dimensions L x W x H
17.8 x 17.8 x
Item weight
454 g
Material
Silicone
Style
1 - Pack

🌿Low VOC, eco-friendly formula

💪Fiber reinforced for superior durability

🛠️UL 181 a-m & b-m certified

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

€ 176.91

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Austria.

Secure transaction

Description

🔥 Seal smart, breathe easy — the pro’s choice for HVAC perfection!

BUILT TO LAST - Fiber reinforcement delivers unmatched flexibility and adhesion for long-term reliability.
MADE IN THE USA - Proudly crafted with precision in Oklahoma, supporting quality and local manufacturing.
ECO CONSCIOUS CHOICE - Low VOC water-based formula keeps your workspace safe and LEED EQ 4.1 compliant.
CERTIFIED PERFORMANCE - UL 181 a-m & b-m certification ensures trusted, industry-leading duct sealing.
VERSATILE APPLICATION - Seals all HVAC duct types—metal, fiberglass, and flexduct—for seamless integration.

Red Devil 0841DX F-Seal 181 is a fiber reinforced, water-based duct sealant designed for both indoor and outdoor HVAC applications. UL 181 a-m & b-m certified, it offers excellent adhesion, flexibility, and low VOC emissions, making it a durable, eco-friendly solution compatible with all duct types. Made in the USA, it supports LEED EQ 4.1 standards and ensures professional-grade sealing performance.

Specifications

ASIN	B01I7JVUO0
ASIN	B01I7JVUO0
Batteries	1 Unknown batteries required.
Best Sellers Rank	#97,231 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #122 in Heating & Cooling Ducting Products
Brand Name	Red Devil
Color	Gray
Compatible Material	Plastic
Customer Reviews	4.4 4.4 out of 5 stars (1,246)
Customer reviews	4.4 4.4 out of 5 stars (1,246)
Date First Available	11 July 2016
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	1 Pounds
Item model number	0841DX
Manufacturer	Red Devil
Manufacturer	Red Devil
Material Type	Silicone
Model	0841DX
Number of Items	1
Part Number	0841DX
Product Dimensions	17.78 x 17.78 x 20.32 cm; 453.59 g
Style Name	1 - Pack
Supported Standards	UL 181 a-m, UL 181 b-m
Surface Recommendation	Duct
UPC	075339003466
Unit Count	128 Milliliters
Water Resistance Level	Water Resistant

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

Zainab N.

Fantastic and great service. Shipping was faster than expected.

1 week ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.