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Internet #205671519

Model #483503

Store SKU #1001358552

33 fl. oz. Fence Post Mix

$1372
  • Sets in just three minutes with no tools required
  • Effectively replaces two 50 lb. bags of concrete mix
  • Can be used with wood, steel and PVC posts
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Price:
$1372

Product Overview

Sika PostFix is a two component, pre-proportioned polyurethane resin. It is mixed in the bag to produce expanding foam for supporting and backfilling fence, mail box, gate and signage posts. Suitable for all types of posts including wood, steel and PVC.
  • Lightweight pouch replaces two 50 lb. bags of post mix
  • Fast setting
  • High strength
  • No water or special tools needed
  • Simple and fast application
  • VOC compliant in all 50 states



Info & Guides

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Specifications

Dimensions

Container Size
33 oz.
Product Depth (in.)
0.5 in
Product Height (in.)
8.5 in
Product Length (in.)
10 in

Details

Returnable
90-Day
Use Location
Floor

Warranty / Certifications

Manufacturer Warranty
One year from date of installation.

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.1
    out of 1,237 reviews
  • 72% recommend this product
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Showing 1-30 of 1,237 reviews
lasted 1 week
I followed the instructions by the book. Some people here say theirs lasted months or even a full year. Mine became soft after 1 week.
by
    • Recommended
    1 person found this helpful
    Had fun watching it grow and the post is very strong. Made the excess of the product look like a ...
    Had fun watching it grow and the post is very strong. Made the excess of the product look like a rock.
    by
    • Verified Purchase
    • Recommended
    Worked great. Used two bags
    My post hole was big due to digging out a very large concrete anchor. I never want to dig out concrete again. I purchased two bags of Sika. It was easy to use, set up quickly and it helped me complete my mailbox post project in one day. I used one bag at the base of the hole and a second bag after tamping dirt into a smaller rectangle. Most people will only need one bag with a narrower hole. My neighbors were impressed with the post’s stability utilizing the Sika mix. I definitely recommend this product.
    by
    Response from Sika Retail RepJul 20, 2021
    Thank you for being a Sika customer. SikaRetail
      • Recommended
      Great for signage
      I had to recently install some signs in a city park and we opted to use this as we didn't have access to water. We also wanted to install 4 large signs in one day and this let us do the job in about 4 hours. We held the sign for about 8 minutes until it held them still. Then sat back and took a break and talked for another 15m before backfilling the shallow holes. 1 bag managed to fill both posts of the signs by alternating the pour at 15in deep. So far, they are holding very strong. Even when the wind picked up, no movement at all.
      by
        • Recommended
        1 person found this helpful
        I used it for a basic railing for low exterior stairs, the side with no roots it soared.
        I used it for a basic railing for low exterior stairs, the side with no roots it soared.
        by
        Response from Sika Retail RepApr 6, 2021
        Thank you for being a Sika customer. SikaRetail
        • Verified Purchase
        • Recommended
        2 people found this helpful
        Amazing Product
        Needed to put up a new mailbox post and was looking for the best way to do it. Glad I chose to try the Sika PostFix. I dug the hole and taped 2 levels to the post so I could ensure it stayed upright. I mixed the solution as the package said and poured it in. It ended up expanding well above the level of the hole so I waited a few minutes and it was hard enough to cut. I used a small handsaw to easily cut the material down to the ground level, it is like cutting a dense Styrofoam. I put some dirt on top and the post is straight and solid. Clean up was super easy, throw the bag away and the chunks of excess foam. As a bonus if I ever need to replace the post it will be a lot easier to remove the foam then it would be to break up concrete.
        by
        Response from Sika Retail RepMar 11, 2021
        Thank you for being a Sika customer. SikaRetail
          • Recommended
          2 people found this helpful
          quick and easy setup of lightweight sign posts and mailboxes. make sure you have saw to cut extra...
          quick and easy setup of lightweight sign posts and mailboxes. make sure you have saw to cut extra if it comes out of hole
          by
          • Verified Purchase
          • Recommended
          2 people found this helpful
          Garbage
          Easy to apply. Doesn't hold posts well. Pain to get back out, not as advertised.
          by
            6 people found this helpful
            Not secure enough
            When I dug the recommended hole for how much it said it would fill, it did not reach the top when it was done expanding and as it expanded it got further away from the pole making it barely hold it in place. Had to go buy concrete to fill in completely.
            by
              1 person found this helpful
              YES you CAN cast silicone mold with this!
              Straight to the point..... If you are the one prop maker looking at this stuff and wondering; "can I cast a mold with this stuff?" YES YOU CAN! I've been running a large half pumpkin mold, silicone with a fiberglass shell, all week and this foam is nice. It is a 1:1 mix ratio. 20 second mix time, it changes from cloudy to clear. Foams approximately 10x it's volume. Fully expands in ~3 minutes. Finished skin is smooth and captured details nicely. Has a cure consistency of rigid floral foam, with similar skin texture. Nice hard cell structure. For reference, one 33oz bag filled this pumpkin mold (28"w x 18" h x 7" d) with VERY little overflow. A little back pressure on the mold will help immensely. Demolded easily from silicone mold. Cheers prop makers!
              by
                • Recommended
                14 people found this helpful
                The packages were very easy to use and set our post in minutes, way easier and faster than cement.
                The packages were very easy to use and set our post in minutes, way easier and faster than cement.
                by
                • Verified Purchase
                • Recommended
                1 person found this helpful
                It’s so much faster, cleaner and easier!!! Very little to cleanup afterwards too. I love this stu...
                It’s so much faster, cleaner and easier!!! Very little to cleanup afterwards too. I love this stuff!!!
                by
                • Verified Purchase
                • Recommended
                1 person found this helpful
                DO NOT BUY
                Very easy to work with initially. After a few hours it's very sturdy and seems ready to start working on the fence. But leaving it for a few days the foam will shrink and the post will be very loose. Then you get to pull up the post, cut off the foam, go back to the store, buy the concrete mix and start the process all over. Do not waste your money or time. This is not a time saver.
                by
                  18 people found this helpful
                  I mostly love it
                  I mostly love this product and have been using it to install a vinyl fence. For one of the posts, it rose the post out of the ground about 4”! So that will be something to watch for with lighter materials such as vinyl fence posts. Just keep your hands on it while it sets. I think my husband walked off too early.
                  by
                    • Recommended
                    5 people found this helpful
                    Did the job for me!
                    Southern California resident here. I won't be experiencing frost or high winds in my area like some reviewers. I used this foam to secure a fix-a-fence bracket to a sagging rotted post. I'll most likely have to replace the fence in a few years but this is a good stop gap measure. I used an 8" concrete mold after digging a large whole to get to the depth and diameter required. Followed the package directions and poured in the foam which filled the mold and then some. The foam secured the post in the ground really well and felt solid. I let the foam cure for a few hours before attaching it to the post. However, I checked again and it felt wobbly. Further inspection showed it wasn't the foam that was wobbly, but the whole concrete mold. The dirt around the mold wasn't solid enough to hold it firmly in place. I watered it down and shoved more dirt and gravel in and gave it a day to dry. The next day it felt more solid, even though the surrounding dirt hadn't completely dried. I used a drywall saw to trim the excess foam and attached the post anyway and it looks like a winner. For best results, do what a previous reviewer did and use an auger to dig a straight hole with vertical sides to avoid the loose dirt around the foam.
                    by
                      • Recommended
                      4 people found this helpful
                      Its a great invention, great product makes this cleaner & easier to use compared to cement & is j...
                      Its a great invention, great product makes this cleaner & easier to use compared to cement & is just as strong
                      by
                      • Verified Purchase
                      • Recommended
                      1 person found this helpful
                      Initially happy. One year later, VERY DISAPPOINTED
                      I bought this product to build a privacy fence for my backyard. I decided to use this product instead of conventional concrete from the following reasons: (1) It doesn't weigh much (2) It sets up incredibly fast (3) It creates a waterproof seal against the wood that it is in contact with (4) It couldn't be easier to use (5) The package says that it can be used for fences (6) Promotional videos comparing this expanding foam to conventional concrete show that they have similar pull test results and lateral force results. Upon initial use, all of the points above proved true. The foam expanded like advertised, hardened and the posts seemed very solid. I built my fence and was very happy. Then came winter and the subsequent spring. I've started to notice that most of the posts are leaning a bit. Investigating a little, it was very easy to wobble the post in the hole; the post moved as if nothing was holding it in the ground. My guess as to what happened is that the foam became detached from the post during repeated wind gusts against my fence. My fence is a 6' tall stockade style privacy fence which acts like a sail during high winds. The lateral load on the fence is high during windy weather and the 6' tall fence acts as a lever arm, compressing the foam in the hole until it detaches from the post. Yesterday I decided to pull one of the posts to see if it was truly disconnected from the post. All that I needed to do was pull up on the 4x4 with a sturdy grip to get it out of the hole. I will not be using this product for an application like this again. It is probably fine for an application that will not see high side loading, but this product is NOT a replacement for concrete in fence building (at least not in the North East USA).
                      by
                        51 people found this helpful
                        Very easy to use. Just follow directions and the post will set in less then 5 minutes. One bag co...
                        Very easy to use. Just follow directions and the post will set in less then 5 minutes. One bag could easily work in a hole 3 feet deep. The hole depth I used was about 9 inches across and 24 inches deep. The overflow was about 12 inches above the hole. Once set, there was no movement in the post at all. The excess was fairly easy to cut away with a sharp knife.
                        by
                        • Verified Purchase
                        • Recommended
                        5 people found this helpful
                        This stuff worked as advertised. Follow the instructions and...
                        This stuff worked as advertised. Follow the instructions and presto. Made my job so much easier and I am very pleased with the results. A little expensive but well worth the money.
                        by
                        • Verified Purchase
                        Some don't like this material, but I am a fan. The most important factor in being successful with...
                        Some don't like this material, but I am a fan. The most important factor in being successful with this product is the hole that you are going to set the post in. The hole MUST have vertical sides. If you hand dug the hole with a shovel and it is tapered, forget it, it won't work. Using a manual post hole digger is good, but the ultimate solution is to use a power auger to dig your holes. I used a 6" auger to set 4x4 posts and it worked great. I was able to set two and a half posts with each bag of Sika Post Mix, but you have to be organized and LIGHTNING FAST! Once mixed and and material gets hot, you had better be pouring it into your hole immediately or you'll run out of time. I prefer to use long 1x2's 90 degrees apart to keep the post plumb, that way I can be fast with the material and don't have to worry about holding the post. This ensures that the post stays absolutely still while the material is curing, ensuring a good bond to the post and no air gaps in the hole. After an hour or so, use a paint knife to scrape and trim excess foam from post. Cover with surplus dirt and you're done!
                        by
                        • Verified Purchase
                        • Recommended
                        23 people found this helpful
                        This is the easiest and fastest way to fix a fence when you are short on time. Works very well, a...
                        This is the easiest and fastest way to fix a fence when you are short on time. Works very well, and not messy at all.
                        by
                        • Verified Purchase
                        • Recommended
                        1 person found this helpful
                        I was skeptical, but decided to give it a try. Set 3 posts next to a new ground level deck with ...
                        I was skeptical, but decided to give it a try. Set 3 posts next to a new ground level deck with excellent results. Follow directions carefully (they're simple) and you will have good results. One bag will adequately fill a 36" x 8" hole with a 4x4 post. Cost is reasonable when you factor in your time, sweat, clean-up, and back ache with cement. 10' posts are set solid, with no slop or wiggle. Will definitely use again!
                        by
                        • DIY
                        • Recommended
                        12 people found this helpful
                        Stuff works like a charm. One suggestion though - the mixing instructions are (understandably) c...
                        Stuff works like a charm. One suggestion though - the mixing instructions are (understandably) conservative and can result in foam material that does not cure as hard as it could. I mixed it on a cloudy evening with ambient temps in the 80's. The first two holes I prepared the material by mixing as they suggest for 15 seconds and then poured quickly. The foam expanded as described. The last four holes I mixed the material until I could feel it warming up (about 30 seconds +/-) then quickly cut the corner and poured the material - it expanded better. All six posts are satisfactory, but the four that were filled with the material mixed longer are considerably more stable. That was my experience - I'm sure that if you're in direct sunlight on a hot (90+ degree day) you may have to be quicker about it. Much like concrete, it takes a few tries to get familiar with the material.
                        by
                          • Recommended
                          26 people found this helpful
                          mailbox post
                          I dug a hole way to Big. this product filled the hole and is keeping the pole tight
                          by
                            • Recommended
                            1 person found this helpful
                            Awesome alternative for concrete! I was very surprised of how sturdy the mailbox post was after t...
                            Awesome alternative for concrete! I was very surprised of how sturdy the mailbox post was after the product cured for 2 hours. I highly recommend that the post is braced plumb before the pour. When product expands, it can move the post out of plumb. While the product expands, make sure the post doesn't move out of plumb...
                            by
                              • Recommended
                              4 people found this helpful
                              So much easier that concrete and sets up faster. Costs more but well worth it for one or 2 post....
                              So much easier that concrete and sets up faster. Costs more but well worth it for one or 2 post. I would not use it for a whole fence line simply because of the cost associated with it.
                              by
                              • Verified Purchase
                              • Recommended
                              Very easy to use. No mess, great for small projects, single post settings
                              Very easy to use. No mess, great for small projects, single post settings
                              by
                              • Verified Purchase
                              • Recommended
                              We used Sika on 11 postholes. Was a nice cool day (50 degrees) so it gave us plenty of time to mi...
                              We used Sika on 11 postholes. Was a nice cool day (50 degrees) so it gave us plenty of time to mix and pour. We did take the time to level and stabilize all posts just like you would for concrete in advance and everything worked fantastic. No need to use concrete ever again.
                              by
                              Response from Sika Retail RepOct 19, 2018
                              Thank you for being a Sika customer! SikaRetail
                              • DIY
                              • Verified Purchase
                              • Recommended
                              1 person found this helpful
                              Easy to mix and hardened fast. Worked great for my mailbox post.
                              Easy to mix and hardened fast. Worked great for my mailbox post.
                              by
                              Response from Sika Retail RepSep 25, 2018
                              Thank you for being a Sika customer! SikaRetail
                              • Verified Purchase
                              • Recommended
                              This worked perfect for my 4x4 pressure treated mail box post. It was quick and easy, just follow...
                              This worked perfect for my 4x4 pressure treated mail box post. It was quick and easy, just follow the directions. I did it on a hot day so be prepared it all happens quickly.
                              by
                              Response from Sika Retail RepSep 13, 2018
                              Thank you for being a Sika customer! SikaRetail
                              • Verified Purchase
                              • Recommended
                              Showing 1-30 of 1,237 reviews