Prices, Promotions, styles, and availability may vary. Our local stores do not honor online pricing. Prices and availability of products and services are subject to change without notice. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted.

Mix-In-The-Bag Expanding Polyurethane Post-Setting Foam Fast Setting 33 -fl oz Repair accessory

Ratings & Reviews for Sika Mix-In-The-Bag Expanding Polyurethane Post-Setting Foam Fast Setting 33 -fl oz Repair accessory

4.0
816
Review
 4 out of 5
816 Reviews


74% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

The product is easy and quick to use, with a fast set time, and is lightweight and mess-free compared to traditional concrete. However, it may not be as structurally strong, especially for applications requiring high stability or weight-bearing. The product works best for simple, standalone uses like mailbox posts or light-duty fencing, but users need to carefully follow the instructions to avoid issues. Overall, it can be a good option for certain light-duty post installation projects, but concrete may still be the better choice for critical structural applications.

Customer review summary generated by AI, including incentivized reviews.
816 Customer Reviews

Product does not work

Would Not Recommend

Put it around 4 x4 post. did not secure post. They were moving side to side after the product cured. A complete waste of money and time. Do not buy this product or you will be sorry.

December 28, 2025
Was this Review Helpful ?

Product didnt work...

Product didnt work... have used before and this time didnt mix, heat or foam. Had to switch to sakrete.

December 19, 2025
Verified Purchaser
Was this Review Helpful ?

Great alternative to concrete.

Would Recommend

Have used this for fencing and mailbox posts. It is quick hardening, easy to mix, and holds the posts securely.

December 15, 2025
Verified Purchaser
Was this Review Helpful ?

wear safety gear

easy to use

December 10, 2025
Verified Purchaser
Was this Review Helpful ?

Great Stuff!!

Would Recommend

First time user. Thought i would try instead of mixing up a small batch of cement for 4x4 8' post in late fall. Filled 2' hole over top, hardened in 30 minutes where you could not move post. Trimmed off excess following day. Waiting to see next spring how well it holds up over the winter. Use care as it is very sticky at first. Amazing stuff.

December 9, 2025
Verified Purchaser
Was this Review Helpful ?

Disappointed.

Would Not Recommend

The procedure to break the seal to mix the product does not go as they claim. It was a struggle to break and the bag popped. Lost most of the product. What I was able to fill the hole with went as advertised. If you buy make sure you have the bag towards the hole your trying to fill just in case what happen to me.

December 3, 2025
Verified Purchaser
Was this Review Helpful ?

Did Not Work as Intended – Failed to Set Po

Would Not Recommend

I purchased the Mix-In-The-Bag Expanding Polyurethane Post-Setting Foam with the intention of securely setting a 4x6 wooden post. Unfortunately, the product did not perform as advertised and completely failed the task. I followed the instructions precisely, mixed the components thoroughly within the bag, and poured the mixture into the post hole as directed. The foam expanded somewhat, but once cured, it was clear the application failed. There was a significant, inconsistent gap between the hard...

November 24, 2025
Verified Purchaser
Was this Review Helpful ?

Foam cuts easily

Would Not Recommend

I'm not sure how long it will hold. Three times as expensive as concrete.

November 24, 2025
Verified Purchaser
Was this Review Helpful ?

Received as described - Thanks!!

Would Recommend

Received as described - Thanks!!

November 16, 2025
Verified Purchaser
Was this Review Helpful ?

Had to use 3 bags. Know how much you need.

Would Recommend

You got to be quick once you squeeze the one side into the other. It works great, put in fence post.

November 13, 2025
Verified Purchaser
Was this Review Helpful ?

Beats mixing concrete especially for small jobs.

Would Recommend

Easy and clean

November 12, 2025
Verified Purchaser
Was this Review Helpful ?

Science at its finest

Would Recommend

Wasn’t sure if the hype was real. I was skeptical this bag could replace to bags of Crete. Sure enough, it works like a champ! I set 2 fence post and it handled the 6x8 fence panel with no problem.

November 9, 2025
Verified Purchaser
Was this Review Helpful ?

Easy to use, does not require water.

For a lighter project, like installing a roadside mailbox post, it is easy to carry around than a bag of quick setting cement and does not require water. It has a one year shelf life, resists water and handles hot/cold temperature extremes.

November 4, 2025
Verified Purchaser
Was this Review Helpful ?

Really great product!

Would Recommend

Very simple to use and very fast!

October 28, 2025
Verified Purchaser
Was this Review Helpful ?

Not as great as it sounded

Would Not Recommend

Initially this seemed like a good product, but the instructions indicated 3 bags would be needed for my mailbox post. With that said, the price is a concern. I went with a cheap bag of Quickcrete that should do the job.

October 24, 2025
Verified Purchaser
Was this Review Helpful ?