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Fast 2K Post Anchor Fast Setting 33.8 -fl oz Fast setting

Name: Fast 2K Post Anchor Fast Setting 33.8 -fl oz Fast setting
Brand: Fast 2K
SKU: 5016218569
Price: 19.98 USD
Availability: InStock
Rating: 4.2 (347 reviews)

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4.2

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Fast 2K™ Post Anchor is a patented expanding composite designed as an alternate to concrete for post-in-hole installations, suitable for load-bearing and non-load bearing applications. With a 25+ year history of pole setting composite backfill products, Fast 2K Post Anchor and H.B. Fuller continue to provide products for setting utility poles, fences, and so much more. Fast 2K ™ Post Anchor has been third-party tested by the ICC and CCMC and meets building code requirements for special foundations and load-bearing elements. One post can be set with as little as one 2.5 lb bag of Fast 2K ™ Post Anchor depending on the size of the hole.

Mixes in 30 seconds, sets in 5 minutes, build on post in 30 minutes
Product does not require water or any additives
Works with multiple post materials and projects: wood, metal and vinyl, decks, fences, mailboxes, pole barns, and more
Adheres to post assisting in prevention of rot or corrosion
Can be used in ambient temperatures ranging from -5°F to 105°F
Meets building code requirements for special foundations and load-bearing elements
Lightweight technology replaces 80lbs of concrete with a 2.5lb bag

General
Color/Finish Family	Yellow	Drive on Time (Hours)	0
Series Name	Post Anchor	Curing Time (Days)	0
Type	Fast setting	VOC Level	0
Base Material	Polyurethane	Dry to Walk	30-60 minutes
Package Quantity	1	Paintable	Yes
Unit of Measure Quantity	33.8	Number of Coats Recommended	1
Unit of Measure	Fluid ounce(s)	Container Type	Bag
Application Method	Trowel

Features
Fast Setting	Yes	Lowe's Exclusive	No

Certifications
CA Residents: Prop 65 Warning(s)	No

Warranty
Warranty	1-year

Compatibility
For Use on Concrete	No	For Use on Mortar	No
For Use on Stucco	No

Miscellaneous
UNSPSC	30111500

Check out the Best Selling Concrete & Mortar Repair on Lowes.com

Review

4.2 out of 5

347 Reviews

79% Recommend this product

Ratings may include incentivized customer reviews.

Read All Reviews

+ 30

What Customers Are Saying

Customers overwhelmingly praise this product for rapid setting, ease of use, and minimal mess compared to traditional concrete. Most highlight posts becoming stable within 5 to 30 minutes with no mixing or water needed, making solo installations convenient. Many find it ideal for small projects like mailbox and fence posts. Some report needing more bags than expected or experiencing inconsistent expansion, particularly in cold weather. Despite minor drawbacks, the vast majority consider the time and effort savings worthwhile for small-scale installations.

Customer review summary generated by AI, including incentivized reviews.

347 Customer Reviews

Sort By

Easiest method to set posts

Would Recommend

Easiest method to set posts. Hard to judge if one or two bags will be needed because my digging is not perfect. Nevertheless, the stuff expands and secures the posts quickly. The product is light-weight so easy to handle. Do not mix the two substances too long, but pour the mixture into the hole. The the foam fills all the gaps and hardens fast. This enables you to work on the rest of the fence.

zmanSeptember 25, 2026
Verified Purchaser

Was this Review Helpful ?

Great

Would Recommend

Put in a new mailbox post this was much easier then a heavy bag of cement would recommend

September 16, 2026
Verified Purchaser

Was this Review Helpful ?

Easy to use, quick to use. However if you aren't careful you can make a giant mess really quick too

pg30September 9, 2026
Verified Purchaser

Was this Review Helpful ?

Works as advertised

Would Recommend

Product worked as advertised. Quick and easy to use. So far mailbox has not moved.

josefSeptember 9, 2026
Verified Purchaser

Was this Review Helpful ?

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31 Questions

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6x6 post how many bags

Can this product be used for CMU Block insulation in a commercial application? If so, what would the insulation value be? Could it be used to stabilize Perlite insulation in the CMU Block Cavities?

How to clean the foam off upholstery

Does anyone think that I might be able to use this with a Flag Pole? Wanted to set the base in a small bit of concrete and then use the Fast 2K to fill the rest of the hole up. 30' flag pole.

This is 33.8 oz not 33.8 pounds like the Lowe's product description says!

Can you mix this INDOORS to set an artificial tree is a 15 x 24 inch ceramic pot

What is the shelf life?

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		Ratings	346
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