Fast 2K Post Anchor Mix | Expanding Composite Footing Compound (Fence, 1)

I used the H.B. Fuller Fast 2K Post Anchor Mix to set a 6‑foot post for a retractable hose reel, and it worked exactly the way it’s supposed to. I followed the directions — all of them — and shockingly, that seems to be the secret sauce. After reading some of the one‑star reviews, I’m convinced a few folks either skipped the instructions or probably shouldn’t be trusted with products that expand, harden, or require more than one brain cell to operate. This stuff isn’t rocket science, but it does require you to do something other than guess. Mix, pour, hold the post steady, and let it do its thing. It expanded, locked in, and cured fast. The post is solid, the hose reel doesn’t wobble, and I didn’t have to haul 80‑pound bags of concrete like a medieval laborer. If you can read and follow simple steps, this product works great. If you can’t… well, your results may vary.

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!

Works beautifully! Decent price and durable. Correct size hole and depth or it overflows like bread dough! Wear clothes/shoes you don't care about as it stiffens quick. Def recommend!

This stuff is great. I'm giving it 4 stars because it's way too daggum expensive. I remember when it was $11 a bag and I thought that was too pricey. I used it to put up an 8'ft vinyl privavy fence 7 years ago. It has held up very well even with strong winds. It was pricey, but fast 2K allowed me to put that fence up by myself quickly without straining my back with heavy bags of concrete. I love the fact that it was very forgiving. I put one post in the wrong place; iit was so easy to dig it up. TIPS:: 1. When I dug my holes, instead of making the sides uniform I dug deep notches in the sides of the hole. This way the foam could go into the notches and that helped prevent any kind of movement later on. 2. When installing fence post, make yourself a jig or some type of stand to hold your post up right until you pour the fast 2K in the hole Have your post leveler already attached to the post. 3. Make sure you pour some mixture all around post.Be prepared to just hold it in place so that you only have to make quick mInor adjustments to level it. Stay calm and stay still for like 9 to 10 seconds. DO NOT MOVE THE POST ONCE THE FOAM STARTS RISING.

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.

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.

I have tried two bags of this and for me it just doesn't work. I love the idea of it and how easy it is to use. But it didn't last. I have a loose fence post. I cleared out the area around it down to where the old concrete was and poured in the mixture and watched as it rose like bread dough around the top of the hole and around the bottom of the fence. It felt secure at the end of the day. It came loose again in two days. I could move the fence post in the foam and within a week the fence was just as bad as before I tried it. Today a new bag arrived. I removed the old foam which comes off very easily. Cleaned off everything and tried again. The foam rose but didn't adhere to fence post in the hole. So now I have a loose fence post with a big yellow foam doughnut around it. Too bad. It was such a good idea. An expensive mistake - $50 for both bags and shipping and a bag of Sakrete would have cost under $20.

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.