---
product_id: 334097086
title: "H.B. Fuller Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound"
brand: "h.b. fuller"
price: "$20.68"
currency: USD
in_stock: false
reviews_count: 5
category: "H.B. Fuller"
url: https://www.desertcart.us/products/334097086-h-b-fuller-fast-2k-fence-post-mix-and-concrete
store_origin: US
region: United States of America
---

# Ready to build in 15 minutes Waterproof & hydrophobic to prevent rot Lightweight 32.8 oz bag replaces 80-100 lbs concrete H.B. Fuller Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound

**Brand:** h.b. fuller
**Price:** $20.68
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Build Faster, Stronger & Smarter with Fast 2K!

## Quick Answers

- **What is this?** H.B. Fuller Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound by h.b. fuller
- **How much does it cost?** $20.68 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/334097086-h-b-fuller-fast-2k-fence-post-mix-and-concrete)

## Best For

- h.b. fuller enthusiasts

## Why This Product

- Trusted h.b. fuller brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Pro-Grade Strength:** Uses the same expanding composite tech trusted by utility pros for rock-solid, long-lasting post stability.
- • **Hydrophobic Defense:** Waterproof formula protects posts from rot, rust, and deterioration—extend your fence’s lifespan effortlessly.
- • **Speedy Setup, Zero Wait:** Mixes in seconds and sets in 15 minutes so your project moves at your pace, not the other way around.
- • **Universal Compatibility:** Bonds seamlessly with wood, vinyl, and metal posts—one solution for all your fencing needs.
- • **Back-Saving Lightweight Power:** Ditch the heavy concrete—just 32.8 oz of patent-pending mix replaces up to 100 lbs of mess and strain.

## Overview

H.B. Fuller’s Fast 2K Fence Post Mix is a revolutionary 32.8 oz expanding composite footing compound that replaces traditional concrete for fence and mail post installations. Lightweight and mess-free, it sets in just 15 minutes, offers superior strength with professional-grade technology, and features a waterproof, hydrophobic formula that protects posts from water damage and decay. Compatible with wood, vinyl, and metal, it’s the smart, efficient choice for modern DIYers and pros alike.

## Description

H.B. Fuller Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound : desertcart.ae: Tools & Home Improvement

Review: Fast, Reliable, and Easy to Use! - Fast 2K Fence Post Mix exceeded my expectations! I was looking for an alternative to traditional concrete that would save me time and effort, and this product delivered. The setup process was incredibly simple—just mix, pour, and let it set. Within minutes, the post was firmly in place, and I didn't have to deal with heavy bags of concrete or long curing times. I also appreciate that it expands to create a strong and stable hold, making it ideal for fence posts and other outdoor projects. Plus, it's lightweight and easy to store, which is a huge bonus. If you're looking for a fast, mess-free way to secure posts without the hassle of concrete, this is the perfect solution. Highly recommended!
Review: Easy to use, very solid. Will see how it weathers. - I was a bit skeptical after reading the reviews, but this product worked great for my application. I was installing a mailbox post. I used a 4x4 and a hole about 12" wide and about 18" deep (yeah, maybe I should have gone deeper, but being lazy ...). I dug the hole and used the filler per directions. The post was a little further back in the hole than it should have been (so backside got less of the goo). The stuff poured easily after mixing and filled the hole well. There were some air spots near the post itself (will see what happens when things freeze). I had to cut excess around the top, but after it set, everything was really very solid. Overall, impressed with how sturdy the post is. As I say, there were air pockets around the post though, so I am a little wary about what will happen when those fill with water and freeze. Will have to wait another year or two to see how that goes. Overall, impressed. Much easier than a wheelbarrow full of cement mix.

## Features

- SAVE YOUR BACK: Quick, lightweight patent pending technology replaces 80-100lbs of concrete with a lightweight bag that does not require messy mixing with water that requires cleanup & preparation for filling post holes
- FAST & SECURE: Ready to build in 15 minutes, and mixes in seconds in place and in the bag. All that you need in a compact and lightweight 32.8 oz bag that mixes into a waterproof protection for your fence posts.
- PRO TECHNOLOGY: It's the same technology used to set utility poles by the professionals. Now you can quickly and securely set your fence posts and mail posts with a minimum of fuss & mess securely.
- EXPANDING COMPOSITE TECHNOLOGY: Fast 2K Fence Post Backfill uses an expanding composite technology which is stronger than traditional concrete. Designed to adhere to wood, Vinyl and metal posts.
- HYDROPHOBIC TO PREVENT ROT: Unlike concrete which absorbs water which can damage metal and wood, the Fast 2K product is waterproof and hydrophobic which prevents water from getting into your posts, reducing rot, rust, deterioration and other water-related damage.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00LAFUC34 |
| Brand | H.B. Fuller |
| Brand Name | H.B. Fuller |
| Color | No Color |
| Colour | No Color |
| Compatible Material | Metal, Vinyl, Wood |
| Container Type | Bag |
| Customer Reviews | 4.3 out of 5 stars 1,667 Reviews |
| Global Trade Identification Number | 00669602000322 |
| Included Components | Multitool Accessory |
| Item Form | Foam |
| Item Package Quantity | 1 |
| Item Type Name | Fast 2K 26OZ Back Fill |
| Item Weight | 998 g |
| Item form | Foam |
| Item package quantity | 1 |
| Manufacturer | H.B. Fuller |
| Material | Adhesive , Sealant |
| Material Type | Adhesive, Sealant |
| Model | 250 |
| Number of Pieces | 1 |
| Other Special Features of the Product | Waterproof |
| Part Number | 254-20-S |
| Special features | Waterproof |
| UPC | 713976908484 669602000322 |
| Unit Count | 1 Count |
| Volume | 32.8 Fluid Ounces |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** H.B. Fuller
- **Colour:** No Color
- **Item form:** Foam
- **Material:** Adhesive, Sealant
- **Special features:** Waterproof

## Images

![H.B. Fuller Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound - Image 1](https://m.media-amazon.com/images/I/41S0b3GtQZL.jpg)
![H.B. Fuller Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound - Image 2](https://m.media-amazon.com/images/I/71Rj6M+7aJL.jpg)
![H.B. Fuller Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound - Image 3](https://m.media-amazon.com/images/I/81xHqBI6O5L.jpg)
![H.B. Fuller Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound - Image 4](https://m.media-amazon.com/images/I/91ugHBzpvdL.jpg)
![H.B. Fuller Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound - Image 5](https://m.media-amazon.com/images/I/71A0ziV8R3L.jpg)

## Questions & Answers

**Q: Could this be used to fill a plaster of Paris mold?**
A: Not that I'm aware of, it doesn't really say on the package but it does sit up very fast and is very durable. Sorry but that's the best I can answer your question.

**Q: Could this be used to hold an 8x8 supporting a substantial weight?**
A: I had to replace a 4x4 post for my mailbox and used this 2K Post Back Fill. I already had a deep hole in the cement, so this stuff fills up the gaps beautifully all around and keep the post solidly planted. I'm not sure about 8x8, weight is not the issue here but you would need a "solid" hole like in my case to hold to post, then this foam would then fill up any gaps. Good luck.

**Q: Can this be used to form the deck list foundation where the 8x8 post then sits on top held by a bracket anchored in the foundation?**
A: No, Fast 2K can only be used for installing posts that are sunk into the ground.  It cannot be used as a foundation material nor can any brackets be anchored into it.

**Q: Would this be good to use for posts for a horse fence strong and sturdy?**
A: Yes, also sets up quick and should be good for a horse fence.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fast, Reliable, and Easy to Use!
*by A***4 on 8 May 2025*

Fast 2K Fence Post Mix exceeded my expectations! I was looking for an alternative to traditional concrete that would save me time and effort, and this product delivered. The setup process was incredibly simple—just mix, pour, and let it set. Within minutes, the post was firmly in place, and I didn't have to deal with heavy bags of concrete or long curing times. I also appreciate that it expands to create a strong and stable hold, making it ideal for fence posts and other outdoor projects. Plus, it's lightweight and easy to store, which is a huge bonus. If you're looking for a fast, mess-free way to secure posts without the hassle of concrete, this is the perfect solution. Highly recommended!

### ⭐⭐⭐⭐⭐ Easy to use, very solid. Will see how it weathers.
*by W***D on 16 April 2025*

I was a bit skeptical after reading the reviews, but this product worked great for my application. I was installing a mailbox post. I used a 4x4 and a hole about 12" wide and about 18" deep (yeah, maybe I should have gone deeper, but being lazy ...). I dug the hole and used the filler per directions. The post was a little further back in the hole than it should have been (so backside got less of the goo). The stuff poured easily after mixing and filled the hole well. There were some air spots near the post itself (will see what happens when things freeze). I had to cut excess around the top, but after it set, everything was really very solid. Overall, impressed with how sturdy the post is. As I say, there were air pockets around the post though, so I am a little wary about what will happen when those fill with water and freeze. Will have to wait another year or two to see how that goes. Overall, impressed. Much easier than a wheelbarrow full of cement mix.

### ⭐⭐⭐⭐⭐ Crazy stuff, but it works great!
*by L***E on 19 October 2023*

I got this to secure my mailbox post in the ground. The post needed to be dug up and raised recently and I came across this product when looking for some kind of cement to make sure it stays put after this second install. It was very easy to mix up and pour out. We were mesmerized by the process of the liquid becoming the hardened foam type end result. Very cool to watch. After about a half hour, it was pretty firmed up. A bunch had come up higher than we wanted, but we covered it with rocks to hide it. It seems very sturdy after several weeks have passed. Hopefully it holds up through the winter. It was a little hard to remove from skin, so make sure everyone helping is wearing gloves too - they'll thank you later. They do include them in the package which is convenient. Overall, this was an inexpensive and quick way to do the job. I recommend. Update: it has been almost a year and it is still sturdy. No change over the winter at all. Looks like it's going to hold up just fine.

## Frequently Bought Together

- Fast 2K Fence Post Mix and Concrete Alternative and Replacement for Fence Post and Mail Post Installs. 32.8 oz Bag of Expanding Composite Footing Compound
- Johnson Level & Tool 175-O Orange Post & Pipe Level, 4" x 5" x 9", Orange, 1 Level

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-09-29*