Will this strengthen the partially rotted tops of 4 x 4 red wood deck posts, fill the rot cavity, and firmly hold screws?

I have used this product and Minwax wood hardener. Minwax is the better product. It penetrates deeper and strengthen the wood. I wood follow up with an exterior grade wood filler to fill any rotted out voids then carry on with your fasteners.

I am a fan. However there is no way it can be sprayed on. it's very thick and i can't comprehend it being in a spray bottle. Think honey or syrup. As a handyman profesional I love this. I just did 3 days doing roof trim repair that had rot and carpenter ant damage. The fibers are loose like straw. this firmed them up enough for me to put in wood epoxy.

Chemically, what is this stuff?

http://www.jb-weld.co.uk/images/technical-data-sheets/J-B-Weld-MSDS-Wood-Restore-Epoxy1.pdf

Can this be used outdoors?

yes it can. I used it on exterior window trim.

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J-B Weld 40001 Wood Restore Liquid Hardener - 1 Pint

J-B Weld 40001 Wood Restore Liquid Hardener - 1 Pint

Product ID: 212349225

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Details

Brand
J-B Weld
Specific Uses For Product
wood
Compatible Material
Wood
Item Form
Liquid
Special Feature
Strong

💧Eliminates moisture in wet wood

⏱️Fast drying in minutes

🛠️One-component easy application

Description

🪵 Harden your wood, not your schedule!

RAPID STRENGTH BOOST - Dries quickly to lock in durability and speed up your restoration projects.
EFFORTLESS APPLICATION - Single-component liquid formula means no mixing—just apply and go.
MOISTURE BARRIER POWER - Seals and stabilizes rotted or damp wood, preventing further damage.
PERFECT BASE FOR FILLERS - Creates a solid, stable foundation for wood fillers and putties to adhere flawlessly.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly made in the USA, ensuring quality and reliability for your wood repairs.

J-B Weld 40001 Wood Restore Liquid Hardener is a fast-drying, single-component liquid designed to penetrate and stabilize rotted or wet wood surfaces. It eliminates moisture, providing a strong, solid base for wood fillers and putties, making it an essential tool for professional-grade wood restoration and repair.

Specifications

Brand	J-B Weld
Specific Uses For Product	wood
Compatible Material	Wood
Item Form	Liquid
Special Feature	Strong
Item Package Quantity	1
Package Information	Bottle
Item Volume	16 Fluid Ounces
UPC	043425400017
Global Trade Identification Number	00043425400017
Manufacturer	J-B Weld
Country of Origin	USA
Model number	40001
Item Weight	454 g
Product Dimensions	5.08 x 10.16 x 17.78 cm; 453.59 g
Item model number	40001
Item Height	7 Inches
Item Width	4 Inches