QUIKRETE Mailbox Project

Name: QUIKRETE Mailbox Project
Brand: QUIKRETE
SKU: GR_5810
Price: 177.84 USD

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If you want to upgrade your mailbox, complete your project easily with the Quikrete Mailbox Project. The unique blend of fast-setting concrete mix has fast-setting types of cement, sand, and gravel that are designed to set hard in approximately 20 to 40 minutes. You'll have a perfectly set mailbox post with the post level that hooks any quickly and easily. And for homeowners who require a traditional mailbox, the Elite Large mailbox provides the perfect solution. Its galvanized steel construction is highly durable and will ensure long service life. The powder-coated finish ensures that the mailbox will enjoy a long service life. Give your mailbox and upgrade with the Quikrete Mailbox Project.

QUIKRETE 50 -lb Fast setting Concrete mix

QUIKRETE Fast-Setting Concrete Mix is used for setting posts, sleeves and anchors, for pouring slabs 2 In. or thicker, and for applications where a fast-setting general purpose concrete is desirable.

A special blend of fast-setting cements, sand and gravel designed to set hard in approximately 20 to 40 minutes
When setting a post simply pour out of the bag into the hole and add water (no mixing required)
Suitable for setting post and pouring slabs when rapid return to service is required
Exceeds the requirements of ASTM C 387
4,000-PSI provides impressive strength and durability

General
Color/Finish Family	Gray	Unit of Measure	Pound(s)
Manufacturer Color/Finish	Gray	Drive on Time (Hours)	168
Product Type	Concrete mix	Curing Time (Days)	28
Type	Fast setting	VOC Level	0
Material	Concrete	Compression Strength (PSI)	4000
Package Type	Bag	Dry to Walk	1-2 hours
Unit of Measure Quantity	50	Working Time in Minutes	20

Dimensions
Curing Time Measurement	28-days

Features
Fast Setting	Yes	Set Time (Minutes)	30
Premixed	Yes

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -

Warranty
Warranty	1-year limited

Miscellaneous
UNSPSC	30111500

Review

4.7 out of 5

3353 Reviews

96% Recommend this product

Ratings may include incentivized customer reviews.

+ 87 images

What Customers Are Saying

This concrete mix sets up quickly, often in 20-40 minutes, allowing for fast completion of projects. It is easy to use - just add water to the dry mix. Customers report the concrete dries hard and strong, providing a sturdy foundation. Many find it a significant time-saver compared to traditional concrete, enabling single-day project completion. While more expensive, the convenience and speed make it worthwhile for most users' needs.

Customer review summary generated by AI, including incentivized reviews.

3353 Customer Reviews

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Do not let this product package get damp before us

Would Recommend

Effective post anchor with no need to premix. Simply dig hole large enough for post with a few extra inches all the way around, pour 1/3 dry mix, water it, tamp it, repeat.

AnnieJune 12, 2026
Verified Purchaser

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Really works

Would Recommend

Works great, did what it says. Used to put in posts for a clothesline, worked great and dried super fast.

Kingtj134June 8, 2026
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Quick easy concrete material

Would Recommend

Used few times for various projects. From making steps/slabs to filling in damaged concrete outside. Fast setting makes it easy to mix and throw into your project without too much concern for exterior interactions. Make sure you read directions or read online for proper mixing.

DIYdjJune 2, 2026
Verified Purchaser

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Sets quickly but still provides time for leveling

Would Recommend

Works very quickly, yet still give you enough time to level the post. Just pour in the cement mix, followed by the water. Use a stick to poke holes in the mix a little using a piece of rebar or a stick of some sort after the cement mix and the water is inside the hole. This allows the water to penetrate down into the full depth of the hole.

BuildsMay 27, 2026
Verified Purchaser

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Game changer for a DIY greenhouse build

Would Recommend

I used QUIKRETE Fast-Setting Concrete Mix to set the support beams for a backyard greenhouse, and I couldn't be happier with how it went. I'm not a contractor, just a homeowner who likes to tackle projects, and this product made the whole process completely manageable on my own. No mixing, no wheelbarrow, no guesswork. I poured the dry mix straight into the holes, soaked it with water, and within about 30 minutes everything was locked in solid. The beams haven't budged since. If you've been putt...

RoLo TappanMay 20, 2026
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The perfect concrete

Would Recommend

I love how it does take forever to dry

TonyJune 12, 2026
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Great product

Would Recommend

Easy and convenient to mix and sets up fast

TammieJune 7, 2026
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Fast setting indeed!!!

Would Recommend

Just as described worked very well for mailbox post

Frank FJune 6, 2026
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Easy to use. Completely set in under 48 hours.

Would Recommend

Quick setting and easy to use. I did not mix the product. Instead, I poured it into my container and covered it with water, allowing the water to slowly seep into the concrete and saturate it. This was how it is instructed to be used and it worked wonderfully.

CuriousGreensMay 27, 2026
Verified Purchaser

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/d81d8cb4-57d7-5c1c-b629-5acc15c7e6b9

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Quick and easy

Would Recommend

It sets very well in the form

TydieJune 7, 2026
Verified Purchaser

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QUIKRETE Mailbox Project

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