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 Sika Boom 180 Expanding Foam Gaps and Cracks Sealant, 750 mL, Light Yellow

SIKA Sika Boom 180 Expanding Foam Gaps and Cracks Sealant, 750 mL, Light Yellow

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

Description

🌟 Secure your posts like a pro—fast, flawless, and built to last!

RAPID SET POWER - Get your posts stable in minutes, not hours.
ALL WEATHER WARRIOR - Reliable performance from freezing cold to scorching heat.
EFFORTLESS MIX APPLY - Mixes right in the bag—no mess, no fuss, just snip and stir.
SEAMLESS NATURAL BLEND - Light green foam that disappears into your yard’s landscape.
UNIVERSAL POST PROTECTOR - Perfect for wood, steel, aluminum, and PVC posts alike.

Sika Postfix Fence Post Mix is a light green, mix-in-the-bag expanding foam designed to quickly seal and support non-structural posts such as fences, mailboxes, and signage. It sets within minutes, blends naturally with outdoor surroundings, and withstands extreme temperatures from -22°F to 130°F. Compatible with wood, steel, aluminum, and PVC, it offers a mess-free, durable solution for professional-grade post installation.

Specifications

ASIN	B01N1Q5YNE
Best Sellers Rank	#260,468 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #36 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 468 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
Number of Packs	1
Part Number	Sika - 483503
Style	Industrial
Style Name	Industrial
UPC	815202002611
Unit Count	1 Count
Warranty Description	Warranty

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