Am i missing something or is this way more expensive than concrete? I know concrete can be a pain, but this stuff looks to be 4 or 5 times the price.

Yes, this is way to expensive. Home Depot and Lowes in Texas sells it for 9.88 a bag

Can I mix in a container other than the bag to use smaller amounts at a time?

This product appears to be a typical two-part expanding polyurethane foam. These are not particularly unusual products. They are usually not air-activated. You mix the two chemicals together in equal parts and then fairly quickly the reaction takes place and the liquid expands into a rigid foam. You could probably extract equal portions of the two chemicals from the two pouches, but really since you're here on Amazon just search for expanding polyurethane foam and you'll find the chemicals in various quantities where you won't have to deal breaking into the bag and then storing the ruptured bag(s).

Can this be used to set Deck Posts?

Its advertised to do so but I have not used mine...waiting on spring

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Expanding Foam Fence Post Mix

Product ID: 58061508

Details

Brand
SIKA
Item Weight
2.5 Pounds
Item dimensions L x W x H
8.5 x 9.8 x 2
Material
Polyurethane
Style
Industrial

🌿Light green blends with nature

⏱️Sets in minutes

🌡️Works from -22°F to 130°F

£46.42

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Description

🚀 Lock it down fast, blend it in naturally, and weather any storm!

RAPID SET POWER - Get your posts rock-solid in minutes, not hours.
EFFORTLESS MIX APPLY - Mixes right in the bag—no mess, no fuss, just snip and stir.
WEATHERPROOF DURABILITY - Built to withstand extreme temps from freezing cold to scorching heat.
SEAMLESS NATURAL CAMOUFLAGE - Light green foam that disappears into your yard’s landscape.
UNIVERSAL POST COMPATIBILITY - Perfect for wood, steel, aluminum, and PVC posts alike.

Sika Postfix Fence Post Mix is a fast-setting, expanding polyurethane foam designed to securely seal and support non-structural posts like fences, mailboxes, and signage. Its light green color blends naturally with outdoor environments, while its durability spans extreme temperatures from -22°F to 130°F. The mix-in-the-bag formula ensures quick, mess-free application, compatible with wood, steel, aluminum, and PVC posts for versatile, professional-grade installation.

Specifications

ASIN	B01N1Q5YNE
Best Sellers Rank	#225,426 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #39 in Decking Posts
Brand	SIKA
Brand Name	SIKA
Color	Light Green
Compatible Material	Alloy Steel, Aluminum, Polyvinyl Chloride, Wood
Customer Reviews	4.4 out of 5 stars 467 Reviews
Global Trade Identification Number	00815202002611
Included Components	Sika - 483503
Item Dimensions	8.5 x 9.8 x 2 inches
Item Form	Foam
Item Type Name	Sika - 483503
Item Weight	2.5 Pounds
Item dimensions L x W x H	8.5 x 9.8 x 2 inches
Manufacturer	Sika USA
Material	Polyurethane
Material Type	Polyurethane
Model	Sika - 483503
Number of Items	1
Part Number	Sika - 483503
Style	Industrial
Style Name	Industrial
UPC	815202002611
Unit Count	1.0 Count
Warranty Description	Warranty

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£46.42

Duties & taxes included

In stock

Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to UK.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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

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