Fast 2K Post Anchor Mix | Expanding Composite Footing Compound (Fence, 1)
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Availability:
In Stock.
Arrives
Tuesday, Oct 20
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Item Package Quantity: 1
Style: Fence Post Mix
Features
- SAVE YOUR BACK: Lightweight technology replaces 80lbs of concrete with a 2.5lb bag
- FAST & SECURE: Can be used in ambient temperatures ranging from -5F to 105F. Mixes in 30 seconds, sets in 5 minutes, build on post in 30 minutes. Product does not require water or any additives.
- EXPANDING COMPOSITE TECHNOLOGY: Works with multiple post materials and projects: wood, metal and vinyl, decks, fences, mailboxes, pole barns, and more.
- HYDROPHOBIC TO PREVENT ROT: Adheres to post assisting in prevention of rot or corrosion.
- PRO TECHNOLOGY: Meets building code requirements for special foundations and load-bearing elements.
Description
Our Story H.B. Fuller’s commitment to innovation brings together people, products and processes that answer and solve some of the world’s biggest challenges. H.B. Fuller is focused on perfecting adhesives, sealants and other specialty chemical products to improve products and lives. There are three major work processes where customers specify new adhesives – the creation of a new product, the improvement of a current product, and the development of a new way to manufacture a product. And, our market experts get excited about all three. Listening and collaboration aren't just buzzwords at H.B. Fuller. We forge partnerships with our customers to deliver innovative technical know-how. We focus on what’s needed and what’s next in consumer and durable goods manufacturing. Since H.B. Fuller’s beginning as a one-man paste shop in 1887, we have carried on a tradition of developing innovative solutions to meet the needs of our customers. EternaBond MicroSealant ETERNABOND is the only MicroSealant in a tape form available that will stop virtually any leak or water proof any surface in minutes. MIX IT. POUR IT. BUILD IT FAST 2K Fast 2K is a convenient alternative to using concrete for setting fence posts, mailboxes, decks, signs, barn post anchors, and more. North America's Premiere Silicone-Free Adhesive and Sealant An exceptional one-part product that combines ease of application, versatility of use, high ultimate strength, permanent bonds & long service life. Fast 2K Fence is a convenient and fast alternative for setting posts, fences, signs and much more. Fast 2K is a two-part proprietary polymer that expands to fill the peripheral void between the post and the hole. Fast 2k Fence can be used for many different applications, in a wide range of weather temperatures, while simplifying the installation process for fence post. Connecting What Matters
Brand: H.B. Fuller
Material: Adhesive, Sealant
Item Form: Foam
Color: Yellow
Item Package Quantity: 1
Item Form: Foam
Container Type: Bag
Compatible Material: Metal, Vinyl, Wood
Item Package Quantity: 1
Volume: 32.8 fluid ounces
Material Type: Adhesive, Sealant
Color: Yellow
Brand Name: H.B. Fuller
Model: 250
Unit Count: 33.8 Ounce
UPC: 713976908484 669602000322
Number of Pieces: 1
Number of Packs: 1
Global Trade Identification Number: 22
Manufacturer: H.B. Fuller
Included Components: Multitool Accessory
Item Type Name: Fast 2K 26OZ Back Fill
Item Weight: 2.2 pounds
Part Number: 254-20-S
Warranty Description: Warranty
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Oct 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Item Package Quantity: 1
Style: Fence Post Mix
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!
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Reviewed in the United States on May 8, 2025 by awilli9004
Item Package Quantity: 1
Style: Fence Post Mix
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.
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Reviewed in the United States on April 16, 2025 by W. Hazard
Item Package Quantity: 1
Style: Fence Post Mix
This stuff works extremely well. The H.B. Fuller Fast 2K Post Anchor Mix sets fast, expands properly, and locks posts in place like they’re never moving again. From a performance standpoint, it’s fantastic and does exactly what it promises. That said… be prepared. Once you start using it, there’s a very real chance you’ll be wearing it for the next month. If it touches your hands, clothes, tools, soul—congrats, it now belongs there. Gloves are not optional unless you enjoy explaining to people why your hands look like a DIY crime scene. Overall, it’s an outstanding product and incredibly effective. Just plan ahead, suit up properly, and accept that cleanup is more of a commitment than a task.
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Reviewed in the United States on January 7, 2026 by Claycarguy06
Item Package Quantity: 1
Style: Fence Post Mix
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.
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Reviewed in the United States on October 19, 2023 by LG_is_me
Item Package Quantity: 1
Style: Fence Post Mix
So far so good. My replaced fence post with Fast 2K went nicely. Its early, but so far so good as I used mixed concrete for original fence close to 20 years ago. Extreme wind damage over time and Fast 2K Post Anchor Mix has a rock solid grip on post. No swaying. Tips: Follow direction, breaking tab in the middle before mixing. That cost me 30 bucks. Experience is best teacher. Bonus: My post hole was 27'' to 29" and one pack covered about 26" Just topped it off with dirt and grass. Package and "experts" say it covers .5 cubic feet but my bag almost a foot more. WOW.
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Reviewed in the United States on March 23, 2026 by Troy Graves
Item Package Quantity: 1
Style: Fence Post Mix
UPDATE 1-10-15 Items were sent back (Amazon was superb, they provided a free shipping label to return the items and refunded the cost the day after the package was given to UPS). UPDATE 1-15-15 Amazon marked the items as 'received' and the credit still shows, major kudos to Amazon. Lousy is what this stuff was. I was excited and thought maybe their claim "Same advanced technology used to set utility poles for almost 15 years" might be a good indication but I can say categorically that claim is total non-sense. No way a utility company would ever use this, They might have TRIED it 15 years ago on one pole... So the details! (and I will upload pictures, I was VERY disappointed, so much so that I should have returned the empty containers to Amazon for a refund, but it is not Amazon's problem the products is lousy)... I had two posts I was putting up. These are to be posts to hold Just a hand railing, so they are not 'fence' posts, but a 6 foot fence post, holding a fence panel in the wind, (almost like a sail)? No way, this is an epic failure for that application. If you are 'effectively' OK with backfilling your post in with the equivalent of expanding spray foam, then this is your answer (not a good use, that is a pun)... So here is what I did exactly (pictures prove it!). I ordered 2 ($40) of the "Fast 2k Fence Post Backfill - 26 fl oz" packages from Amazon (after watching a video online and seeing someone use it). I read the instructions CAREFULLY (many times) and as you can see (from me wrapping my hand made posts in plastic wrap) I was concerned the blue foam might get on them and stick to them (I also put a bit of plastic wrap on walkway). The posts are regular 4x4 pressure treated that I have applied strips to, cut at an angle, and sanded and painted everything to end up with the posts you see. ONLY from ground level up is the entire design, below grade is regular 'fence post'... I also made a temporary bracket to hold adjustment to get the exact distance I wanted from both the stairs and edge of the walkway. I was thrilled at the idea of something 'encapsulating' the posts I had hand made (and therefore the posts lasting longer not dealing with groundwater rotting them out from below). Then wanting the posts in an exact spot I made up the temporary wooden alignment guide. Now comes the fun, after reading the instruction many times and being scared of the stuff, I CAREFULLY followed the directions. It was a 50+ degree day and I made sure the product was kept inside at the right temperature till I opened the bag. As you can see in my1st photo (that shows the post and the blue foam in the hole only) it did rise while it expanded but it never came up very far. I waited for over 30 minutes and it only 'rose' about 10" I then realized the hole might need a bit more so I prepped bag two and poured that on top (as directed). It too rose but not much (maybe 6 more inches) and you can see what that looked like in the photo that shows the step and foam and walkway edge. At this point I was out of foam and thought 'where will I get more, how much will it take" a guesstimate indicates this hole would have taken 4 bags and the other hole would have taken about 3 more. All said 7 bags at $20 a bag? How is $140 a good deal? NOW the 'epic failure' of this product. AFTER I carefully did not touch the post (It was very well supported) over and hour AFTER the second bag was poured and the surface of the foam was firm (not tacky) I tested the post. It moved a little bit and did not feel solid. I know the hole was not even half way filled so if it were totally filled with the Fast 2k stuff, maybe it would be OK. BUT if it were half filled with regular old cement that had cured there is no question the post would have been ROCK SOLID. I was bummed, I was not sure if I should 'chip' this foam 'junk' out (at this point I was very disappointed and the honeymoon was over) or what. I did not want to use cement then later find I should have removed the foam nonsense. I was NOT looking forward to trying to remove the post and then remove the foam and decided I would use REGULAR $4 a bag cement from the local home center. I went to the home center. bought 6 (50 pound) bags of quick crete and brought them home. I used a couple of bags and topped of the post that I had started using the 2k foam in, then on the other post I used only concrete. I ended up using about 5 bags total for a whopping $20. Had I used concrete from the start I would have used all 6 bags ($24). so $24 for a rock solid backfilled post or $140 for a post I would forever be worried about it getting 'wobbly'? I will NEVER use or recommend the use of this terrible product. I considered calling them and asking for help, but what can they do, it is a lousy solution for this application. I guess if it were a low fence post (that was in the middle of a run) and NOT under a lot of duress (say a short picket fence) MAYBE it might be OK, but a solid stockade fence, a corner post, an end post, or a gate post? absolutely a terrible idea! Don't get me wrong, Expanding foam is a great product and has MANY great uses but this is NOT a good application for it at all.
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Reviewed in the United States on January 5, 2015 by E. Howland
Item Package Quantity: 1
Style: Fence Post Mix
The product essentially worked as advertised (with one notable exception) for me as I used it to secure a mailbox post. The instructions say to combine the 2 parts and mix for 30 seconds to ensure good mixing, which I did do. After the 30 seconds I walked over to the hole to put the product in the hole. As I was approaching the hole I felt the bag get very warm and start to expand like a balloon. Before I could open it and put it in the hole the bag exploded and sprayed the foam in my face, on my arms and head and all over my shirt. I managed to pour what remained in the bag in the hole. I then assessed what damage was done. I was fortunate that I had glasses on which kept the product out of my eyes. My glasses were covered. The product went up my nose as well. I wiped as much as possible away with a towel while it was still fresh but quite a bit hardened on my skin and clothes. As the product hardened it came above grade. After an hour I cut the foam below grade with my Sawzall and speed the dirt over the foam. The post is very stable. If I had only cut the bag open immediately after mixing I don't believe I would have had any issues. I think the instructions for the product should clearly advise of the risk of possible harm from the bag exploding immediately after mixing. If used properly it works well.
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Reviewed in the United States on August 1, 2021 by Peter Ronan
Item Package Quantity: 1
Style: Fence Post Mix
Bought to set a new mailbox post, was surprised at how quickly and easily it expanded. Has been installed for 4 years and you can’t move it if you tried, quite durable. It expands to a much larger extent than i thought it would, more than filled the hole. Excess can easily but cut away.
Reviewed in the United States on May 4, 2026 by Josh Shellabarger