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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Sika Postfix - Fence Post Mix - Light Green - Mix-in-the-Bag Expanding Foam for Supporting Non-Structural Posts - 978 ml

Sika Postfix - Fence Post Mix - Light Green - Mix-in-the-Bag Expanding Foam for Supporting Non-Structural Posts - 978 ml

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

$86.49

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Description

🌟 Secure your posts like a pro—fast, flawless, and weatherproof!

MIX IN THE BAG MAGIC - No mess, no fuss—just snip, stir, and pour for instant readiness.
WEATHERPROOF WARRIOR - Reliable performance from freezing cold to scorching heat.
RAPID SET RAPID SUCCESS - Get your posts secured in minutes, not hours.
UNIVERSAL POST PROTECTOR - Perfect for wood, steel, aluminum, and PVC posts alike.
SEAMLESS NATURAL CAMOUFLAGE - Light green foam that disappears into your yard’s landscape.

Sika Postfix is a light green expanding foam mix designed to quickly seal and support non-structural posts such as fences, mailboxes, and signage. It mixes directly in the bag, sets within minutes, and withstands extreme temperatures from -22°F to 130°F. Compatible with wood, steel, aluminum, and PVC, it blends naturally into outdoor environments for a clean, professional finish.

Specifications

ASIN	B01N1Q5YNE
Best Sellers Rank	#247,749 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #42 in Decking Posts
Brand Name	SIKA
Color	Light Green
Compatible Material	Alloy Steel, Aluminum, Polyvinyl Chloride, Wood
Customer Reviews	4.4 4.4 out of 5 stars (467)
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
Manufacturer	Sika USA
Material Type	Polyurethane
Model	Sika - 483503
Number of Items	1
Part Number	Sika - 483503
Style Name	Industrial
UPC	815202002611
Unit Count	1.0 Count
Warranty Description	Warranty

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$86.49

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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