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....

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

FAST SAFE APPLICATION - Low VOC and quick drying 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 and Sealing Classes for professional-grade reliability.
BUILT TO BRAVE THE ELEMENTS - Weatherproof durability ensures lasting performance inside and out.
UNIVERSAL DUCT COMPATIBILITY - Certified for metal, fiberglass, and flexible ducts—one sealant to rule them all.

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 is safe for sensitive environments and weather-resistant for indoor/outdoor use. Exceeding SMACNA standards, it ensures durable, leak-free performance that boosts energy efficiency and meets strict environmental regulations.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Material	Acrylic
Brand	Red Devil
Style	1 - Pack
Item Weight	12.5 Pounds
Item dimensions L x W x H	17.8 x 17.8 x 20.3 Centimeters
Water Resistance Level	Waterproof
Item Form	Paste
UPC	075339003466
Net Quantity	128.0 millilitre
Global Trade Identification Number	00075339003466
Number of Items	1
Colour	Gray,Red
Surface Recommendation	Metal
Manufacturer	Red Devil
Country of Origin	USA
Item model number	0841DX
Product Dimensions	17.78 x 17.78 x 20.32 cm; 5.67 kg
ASIN	B01I7JVUO0

Red Devil 0841DX F Seal 181 Water Based Duct Sealant, 1 gallon, Gray

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