Skip to content
Shop Your Local Store ● Ship to Your Hometown Store
Pro & Contractor Accounts ● Apply for Net Terms
100,000+ Products ● Trusted Authentic Brands
FAQ Shipping & Returns Order Lookup Contact Account
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.
Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.

Flex Seal Family of Products Flex Seal Black Liquid Rubber Sealant Coating 128 fl. oz.

Made in America

Support American manufacturers + independent hardware retailers in one purchase.

One 128oz can seals roughly 150 sq ft of roof, gutter, or foundation with flexible, UV-resistant rubber - no primer needed.
Flex Seal Family Of Products MPN US855BLK01-2 In Stock & Ready to Ship
Local Price Check i Local stores may price this as low as $98.99. Our online price is $109.99.
$109.99
Free shipping on orders over $149
Ships within 24 hours · most orders arrive in about 2 business days
Cases of 2 · Order in multiples of 2
Ships free on orders over $149 $14.99 flat shipping until your order reaches $149.

Sold by the Case

$219.98 per case of 2

Save $33.00 on orders $75+. Spend $75 or more to unlock 15% off cases plus free shipping — applied automatically at checkout.

Ships as a complete case of 2. Free shipping on orders $75 and up.

About Product Overview

Flex Seal Liquid in the 128-ounce size gives you enough liquid rubber sealant to tackle bigger jobs without running back for a second can. It brushes, rolls, or pours on and cures into a flexible, watertight rubber coating that flexes with the surface underneath instead of cracking like rigid patches do. Because it's UV resistant, it holds up in direct sun as well as it does indoors, and it bonds to most surfaces without needing a primer coat first.

Use it on roofs, gutters, RVs, foundations, flashing, or any spot where you need a durable seal against water and weather. One can covers roughly 150 square feet, so this larger size suits roof sections, larger equipment, or multiple smaller repairs around the property. Clean up with mineral spirits while it's still wet.

  • Container size: 128 oz (can)
  • Coverage area: approximately 150 sq ft
  • No primer required
  • UV resistant for indoor and outdoor use
  • Full cure and recoat time: 48 hours
  • Clean up with mineral spirits

The Details Specifications

Brand Flex Seal Family Of Products
UPC 853517006481
Case Pack Quantity 2 per case
Retail Unit Quantity 2
Dimensions (L × W × H) 14 × 8 × 8
Weight 22 lbs
Country of Origin USA
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
Price check

Go ahead. Check.

You're going to open the other tab. Everybody does. We'd rather say so than pretend otherwise — so open it. We'll wait.

When you're over there, check four things before you click buy.

01

Who's actually selling it

The brand name is on the listing. A different company is in the seller field. Those aren't the same thing, and the second one is who you're buying from.

02

Whether the warranty survives

Most manufacturers only honor a warranty when the unit came through an authorized dealer. We're authorized for Flex Seal Family Of Products. A third-party marketplace seller usually isn't.

03

Where the box came from

Gray-market stock, returns repackaged as new, and outright fakes move through marketplaces constantly. It all looks identical in the photo. It stops looking identical when it fails.

04

Who you call when it breaks

Ours is a phone number with a person behind it who has held this product. M–F, 6 AM – 5 PM Pacific. (866) 469-8556

We're not always the cheapest.

Sometimes you'll find it for less. Sometimes you'll find it for more. On a lot of brands the number is identical everywhere it's sold legitimately — the manufacturer sets a minimum advertised price and every authorized dealer holds it. When a price sits well under that, it's worth asking why before it's worth celebrating.

How pricing actually works
Authorized dealer · Flex Seal Family Of Products

Or skip both tabs and buy it down the street. Find a store near you →

Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

Ask our counter. Or theirs.

Most hardware stores can do more than you think. If we can't help you, the folks down the street probably can — just ask at the counter.

What we offer
Shop Your Local Store Ship to your hometown store
Pro & Gov Accounts Net terms · tax-exempt
Ships Nationwide Direct to your door
Independent Network Real hardware stores
$0.68 of every dollar spent at a local independent business stays in the community. At a national chain, it's about fifteen cents. Civic Economics, multi-city retail studies
100% Authorized & Genuine — Our Guarantee →
Their Counter
Try local first · we'll wait

The stores we send you to are local and independently run — often for generations, the kind of place where someone behind the counter knows the regulars. We don't own them. We just think they deserve the foot traffic. They can put most of what we sell on their next truck. Ask there before you check out here.

Find a local store →
Mon–Fri 6–5 PST
Independent hardware retailer? Join the network →
About our directory. National Hardware Group is an independent retailer and directory. The local stores we list and link to are separately owned and operated — we have no ownership stake in any of them, and most pay us nothing to be included. That includes plenty of stores flying a familiar banner that people don't realize are locally owned and run, not operated by a corporation. Store owners can choose to upgrade their listing for an enhanced presence or pickup features, but the base directory is free, and inclusion is never a paid endorsement.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare