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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Chimney Crown Sealer

Product ID: 228360427

Details

Brand
Item Form
Paste
Material
Elastomeric
Style
Compact
Water Resistance Level
Waterproof

💧100% waterproof elastomeric membrane

⏱️Dries to touch in 30-60 mins

🖌️Brush-on, no primer needed

1624 kr

Duties & taxes included

In stock

Sold byAmazon NorwayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Seal leaks, save time, and protect your home like a pro!

RAPID DRY CURE - Touch dry in under an hour and fully cured within 4 hours, so your chimney is protected fast.
COVERAGE THAT COUNTS - Half gallon covers up to 20 sq. ft., maximizing value while safeguarding your home’s crown jewel.
FLEXIBLE WATERPROOF SHIELD - Seals cracks with a durable, elastic barrier that flexes, preventing leaks season after season.
EFFORTLESS BRUSH APPLICATION - Skip primers and sprays—just brush on two coats for professional-grade protection in less time.
TRUSTED BY PROS HOMEOWNERS - Top-rated with 4.6 stars from 555+ reviews, making it the go-to sealant for lasting chimney care.

MasonryDefender Chimney Crown Sealer is a brushable, elastomeric waterproof sealant designed to protect concrete chimney crowns from water damage. It forms a flexible, durable membrane that resists cracking and chipping, dries quickly within 30-60 minutes, and covers up to 20 sq. ft. per half gallon. Easy to apply without primers, it’s highly rated for long-lasting leak prevention and professional-quality results.

Specifications

ASIN	B08F7ZKG7H
Best Sellers Rank	#21,249 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #90 in Hardware Sealers
Brand Name	MasonryDefender
Color	Light Gray
Compatible Material	Concrete
Customer Reviews	4.6 4.6 out of 5 stars (555)
Item Form	Paste
Manufacturer	SaverSystems
Material Type	Elastomeric polymer
Number of Items	1
Number of Packs	1
Style Name	Compact
Surface Recommendation	Chimney Crown (Concrete)
UPC	709057000918
Water Resistance Level	Waterproof

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