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Internet #205671519

Model #483503

Store SKU #1001358552

33 fl. oz. Sika PostFix Fence Post Mix, Mix-In-The-Bag Expanding Foam for Supporting Non-Structural Posts, Mailbox, Sign

$2040
  • Mix-in-the-bag expanding foam for supporting non-structural posts
  • Sets in as fast as 3 minutes
  • Great for fence, mailbox, gate and sign post setting
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Product Details

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



  • Return Policy

Additional Resources

From the Manufacturer

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Specifications

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Questions & Answers

411Questions
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Q:Is this a closed cell foam and does it absorb water after cutting the top off at the post ground level..
by|Feb 1, 2023
0 Answer
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Q:What is the working temperature range for this product? Its winter here and the temps can get low. How warm does the soil need to be to use this product on my metal fence posts?
by|Jan 21, 2023
1 Answer
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A:  Justin, this product is fine for cold weather applications. However, please note that we recommend conditioning the material to between 65 and 77 degrees Fahrenheit for at least two hours prior to mixing.

by|Jan 23, 2023
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    Q:Can this be used to fill concrete block used in a retaining wall
    by|Jan 19, 2023
    3 Answers
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    A:  Maybe if the foam does not push any of the block up or out.

    by|Jan 23, 2023

      A:  Fac1, Sika PostFix is intended to be used as a backfill for fence posts, mailbox posts, signage pasts, lamp posts, etc. It is not intended to be used for structural posts or posts exposed to a lot of sideways loads, so if you are only planning to use it to "fill in" the concrete block that should be fine so long as it is not being used to structurally support your retaining wall.

      by|Jan 20, 2023

        A:  This product is very lightweight. I would think the weight of concrete would be better suited for use. Also, while somewhat adherent, it is not a bonding agent like a construction adhesive 

        by|Jan 24, 2023
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          Q:can this be used as a filler in concrete steps and a coat of concrete on top for a hole in the step or will the concrete destroy the form
          by|Jan 19, 2023
          2 Answers
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          A:  I would not recommend using Sika PostFix for this application.

          by|Jan 27, 2023

            A:  I don’t think this would work for that purpose, when it hardens it is a little porous so I would think it could disintegrate if exposed. But it has held up great as fence post support in our strong desert wins!

            by|Jan 21, 2023
              Showing 1-4 of 411
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              Customer Reviews

              4.1 out of 5
              (1,576)
              • 4.1
                out of 1,576 reviews
              • 70%recommend this product
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              Showing 1-10 of 1,576 reviews
              Shrinks after expanding!
              The product looks like it will set up nicely as it expands. However, after 24hrs of cure time the foam appears to settle and actually shrinks! This defeats the whole purpose of using an expanding foam! Wasted money and time only to have 4x4 posts covered in a foam base that wobbles back and forth. I used Fast2K applied in the gaps of this junk and it set up PERFECTLY. Recommend Fast2K over this product. No comparison.
              by
              Response from Sika Retail RepAug 12, 2022
              Hi EDB2143 we're sorry to hear of this. Give us a call at 1-800-933-7452 to contact our Technical Service Team and let us know more/how we can help. SikaRetail
                1 found this review helpful
                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
                Response from Sika Retail RepDec 16, 2021
                Hi Adrian, we're sorry to hear this. Project longevity varies from customer to customer, however after only a week, there may have been other factors that effected the overall application. Please feel free to reach out to us with any questions. SikaRetail
                  • Recommended
                  8 found this review 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
                  2 found this review helpful
                  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
                    4 found this review helpful
                    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
                      3 found this review 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
                      3 found this review 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 found this review 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 found this review helpful
                        Garbage
                        Easy to apply. Doesn't hold posts well. Pain to get back out, not as advertised.
                        by
                        Response from Sika Retail RepJan 4, 2022
                        Hi Shayne, we're sorry to hear. Please feel free to reach out and let us know how we can improve. SikaRetail
                          9 found this review 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
                          Response from Sika Retail RepMar 15, 2022
                          Hi Renee, we're sorry to hear this. We recommend pouring the material on the post, in areas where it is expected to make contact, to help promote bond. SikaRetail
                            4 found this review helpful
                            Showing 1-10 of 1,576 reviews