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

€ 69.28

Duties & taxes included

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Fast, durable, and naturally sleek—post support that keeps you ahead of the curve!

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 - Withstands extreme temps from freezing cold to scorching heat.
SEAMLESS NATURAL CAMOUFLAGE - Light green foam blends invisibly into your yard or landscaping.
UNIVERSAL POST COMPATIBILITY - Perfect for wood, steel, aluminum, and PVC posts alike.

Sika Postfix Fence Post Mix is a 978 ml light green expanding foam designed for quick, mess-free installation to support and seal non-structural posts. It sets within minutes, blends naturally with outdoor environments, and endures temperatures from -22°F to 130°F. Compatible with wood, steel, aluminum, and PVC posts, it offers professional-grade durability and ease for all your fencing, mailbox, and signage needs.

Specifications

ASIN	B01N1Q5YNE
Best Sellers Rank	#404,288 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #55 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 (468)
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
Number of Packs	1
Part Number	Sika - 483503
Style Name	Industrial
UPC	815202002611
Unit Count	1 Count
Warranty Description	Warranty

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TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

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5 days ago

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€ 69.28

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

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