Is this ok to be left out in freezing temperatures overnight before application?

probably not, and is not recommended in the application specifications either. Read the specification sheet for the product on the amozon site or on the product site. I will say the product was VERY easy too use.

Should I seal up larger cracks before or after applying this?

I would suggest sealing the crack before applying the final top coat of this product. I did that let the sealed crack dry and then did an overall coating with this. Came out great.

How long will this last on my chimney crown? Can you be more specific than just “years”? (Other products say 15 years.)

couldn't tell you, ask me in 15 years.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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MasonryDefender Chimney Crown Sealer - Brushable Sealant Fixes ed Chimney Tops & Prevents Chimney Leaks

Product ID: 330494147

Details

Brand
Item form
Paste
Material
Polymer
Style
Compact
Water resistance level
Waterproof

⏳long-lasting flexible protection

💧100% waterproof elastomeric sealant

🖌️brush-on easy application

Description

🛡️ Defend your chimney crown like a pro — no leaks, no worries!

MAXIMIZED COVERAGE - Half gallon covers up to 20 sq. ft. saving time and money
EFFORTLESS APPLICATION - Brush on two coats easily for superior coverage and protection
FLEXIBILITY THAT LASTS - Permanently flexible formula that won’t crack or chip over time
TRUSTED BY PROS HOMEOWNERS - 4.7-star rating from 500+ users who fixed leaks for good
SEAL SHIELD WITH CONFIDENCE - Stops chimney leaks fast with a durable, waterproof membrane

MasonryDefender Chimney Crown Sealer is a brushable, elastomeric polymer paste designed to waterproof and protect chimney crowns from water damage. Its flexible, long-lasting formula prevents cracks and leaks, covering 20 sq. ft. per half gallon with easy two-coat application. Trusted by hundreds of users, it’s the go-to solution for durable chimney leak prevention.

Specifications

ASIN	B08F7ZKG7H
ASIN	B08F7ZKG7H
Brand Name	MasonryDefender
Color	Light Gray
Compatible Material	Concrete
Customer Reviews	4.6 4.6 out of 5 stars (537)
Customer reviews	4.6 4.6 out of 5 stars (537)
Date First Available	5 August 2020
Item Form	Paste
Manufacturer	SaverSystems
Manufacturer	SaverSystems
Material Type	Polymer
Package Dimensions	16.7 x 16 x 14.7 cm; 2.48 kg
Style Name	Compact
UPC	709057000918
Water Resistance Level	Waterproof

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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.

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TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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

1 day ago

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

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