Would this be good to use around a dry stack fireplace where cold air pours in through the cracks?

That's certainly not it's intended purpose. I'm sure there are products that would work better for what you want that would also be less expensive.

What happens if this is used in an exterior application?

I used mine in an unusual circumstance, to bond soft decorative brick faces to a high heat painted stainless steel surface (backing to a bio-ethanol fireplace). Even after following instructions for a controlled curing/heating process, the sealant was bonded to the steel nicely and also the soft brick face, but the brick face shrunk slightly, causing the sealant to separate and the brick fell off. Maybe I did something wrong or not long enough. I'd say it is more for an indoor/dry weather free application. Outside it may not dry completely to rain and high humidity. Once bonded and dried completely though it is pretty strong, great adhesion.

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3M Fire Block Sealant FB136, Gray, 10.1 fl oz Cartridge, Single Component | High Temperature and Smoke Passage Resistant

3M Fire Block Sealant FB136, Gray, 10.1 fl oz Cartridge, Single Component | High Temperature and Smoke Passage Resistant

Product ID: 100223598

Details

Brand
3M
Color
Gray
Full Cure Time
24 hours
Item Weight
1.1 pounds
Liquid Volume
10.1 fluid

💧Water-based for easy cleanup

🔥Heat resistant up to 2000°F

🛠️Bonds to concrete, metal, wood & plastic

R$207

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Seal the deal with 3M Fire Block – where safety meets seamless performance!

AIR SMOKE BARRIER - Effectively blocks drafts and smoke passage, enhancing fire safety and energy efficiency.
UNMATCHED HEAT DEFENSE - Withstands scorching temperatures up to 2000°F, keeping your projects safe and secure.
EFFORTLESS WATER CLEANUP - Water-based formula means quick, mess-free installation and disposal.
UNIVERSAL SURFACE BONDING - Adheres flawlessly to concrete, metal, wood, plastic, and cable jacketing for versatile applications.
SAG FREE VERTICAL OVERHEAD USE - Stays put without running or sagging, even in challenging positions.

3M Fire Block Sealant FB136 is a high-performance, lightweight cementitious sealant designed for industrial and commercial fireblocking. It resists extreme heat up to 2000°F, bonds to multiple surfaces including concrete and metal, and features a water-based formula for easy cleanup. Its sag-resistant, quick-hardening paste effectively blocks fire, smoke, and air infiltration, meeting key building codes for enhanced safety and durability.

Specifications

ASIN	B005PYXUEY
Best Sellers Rank	#10,034 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #39 in Adhesive Caulk #79 in Industrial Sealants
Brand Name	3M
Color	Gray
Customer Reviews	4.4 4.4 out of 5 stars (511)
Included Components	3M Fire Block Sealant FB 136, 1 Each
Initial Hardening Time	15 minutes
Item Form	Paste
Item Weight	1.1 pounds
Liquid Volume	10.1 fluid ounces
Manufacturer	3M
Material Type	Plastic
Model	FB 136
Number of Items	12
Number of Packs	12
Part Number	051115165917
Surface Recommendation	Pipe
Temperature Range	1.38E+3 °F
UPC	051115165917
Unit Count	1 Count
Water Resistance Level	Waterproof

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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