#1 Home Improvement Retailer

Internet # 310452050

Model # LFSGRYR01-CS

Store SO SKU #1004575776

Top Rated

Flex Seal Liquid Gray 1 Gal. Liquid Rubber Sealant Coating (2-Pack)

Contains 2 gallons
$219.98
/case($109.99 /gallon)
Apply Now
Save up to $100 on your qualifying purchase 
Apply for a Home Depot Consumer Card
  • Dries to a watertight, flexible rubberized coating
  • Non-hazardous, non-toxic, and nonflammable
  • Brush it, roll it, dip it or pour it for watertight flexible seal
  • View More Details

Free & Easy Returns In Store or Online

Return this item within 90 days of purchase.

Read Return Policy

Ask about this product

Get an answer now with AI

Magic Apron Assistant is an AI virtual assistant. By proceeding, you consent to the recording and use of your information by The Home Depot (and authorized third parties). More information

Product Details

About This Product

Flex Seal Liquid Gray is liquid rubber in a can. Brush it, roll it, dip it or pour it anywhere you need a watertight, flexible coating, and it dries to a strong rubberized barrier that seals out water, air and moisture. This 1 gal. container covers approximately 150 sq. ft., which suits flat roofs, RV roofs, decks, foundations and large gutter runs. For roofing, apply 2 to 3 coats with a 3/4 in. nap roller. When pouring, apply no more than a 1/4 in. layer at a time and build in multiple thin coats, since a single thick layer will cure only on the outer surface. Flex Seal Liquid withstands temperatures from minus 80°F to 350°F and resists rain, snow, sun, hail, UV degradation, mildew and chemicals. It forms a durable, breathable, weatherproof, non-slip barrier that will not shrink or wash away, prevents rust and corrosion, and is safe to use around plants. It dries to a satin gray finish, dries to the touch in 6 to 12 hours and fully cures within 24 to 48 hours. Apply at least 24 hours before heavy rain. Stir before use, do not shake, and do not dilute with solvents or water. This listing is a 2-pack.

Highlights

  • Brush, roll, dip or pour onto concrete, brick, stucco, masonry, wood, copper, plastic, tile, vinyl, fiberglass, metal, aluminum, PVC, EPDM and TPO
  • Each 1 gal. container covers approximately 150 sq. ft. and this 2-pack covers approximately 300 sq. ft. total
  • Dries to a satin gray finish and can only be top-coated with additional Flex Seal Liquid
  • Withstands minus 80°F to 350°F and resists rain, snow, sun, hail, UV degradation, mildew and chemicals
  • Forms a durable, breathable, weatherproof, non-slip barrier
  • Dries to the touch in 6 to 12 hours and fully cures within 24 to 48 hours
  • Prevents rust and corrosion on metal surfaces
  • Safe to use around plants
  • Pour no more than a 1/4 in. layer at a time so the coating cures all the way through
  • Apply to surfaces between 32°F and 120°F and at least 24 hours before heavy rain
  • Stir the contents before use, do not shake
  • Do not dilute with solvents or water
  • Includes 2 containers in this pack
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 310452050

Model # LFSGRYR01-CS

Store SO SKU #1004575776

Specifications

Container Size: 1 Gallon

Dimensions

Container Size

1 Gallon

Details

Application

General Purpose

Application Method

Brush, Roller

Base Material

Rubber

Coating Product Category

Waterproofer/Sealer

Color Family

Gray

Color/Finish

Gray

Coverage Area (sq. ft)

150

Dry to Touch (min.)

30 min

Interior/Exterior

Exterior, Interior

Number per Package

2

Paint Key Features

Chemical Resistant, Fast Drying, High Foot Traffic, High Heat, Low Odor, Low Temperature, Mildew Resistant, Moisture Resistant, Rust Preventative, Sealer, Skid Resistant, Stain Blocking, Stain Resistant, UV/Fade Resistant, Washable, Waterproof

Paint Product Form

Liquid

Paint/Stain Clean Up

Mineral Spirits

Returnable

90-Day

Sheen

Satin

Surface Use

Asphalt, Brick, Ceramic, Composite, Composite/Vinyl, Concrete, Drywall, Fiberglass, Galvanized Metal, Glass, Laminate, Masonry, Metal, Plaster, Plastic, Rubber, Stone, Vinyl, Wood

Transparency

Solid

Questions & Answers

Can this be used to make a rubberized hand grip on galvanized pipe
BySep 9, 2026
0 Answer | 
Answer This Question

Can use on wet cement ?
BySep 8, 2026
0 Answer | 
Answer This Question

Can this be painted over to match house color
BySep 8, 2026
0 Answer | 
Answer This Question

Can I use clear flex sheald on fiberglass eav panels on my pole barn
BySep 3, 2026
1 Answer | 
Answer This Question

Hi there - sounds like a great idea! However, we need a few details before we can make a recommendation. When you get a chance, send us an email at humans@flexsealproducts.com with more details. We're here to help!

By|Sep 3, 2026


    Can I use this on a stained concrete floor As a sealer?
    ByAug 31, 2026
    1 Answer | 
    Answer This Question

    Hey there! Unfortunately, we do not recommend using our products for underfoot applications. If you have any other questions or need project assistance, send us an email at humans@flexsealproducts.com with more details. We're always here to help!

    By|Sep 3, 2026


      Can is use this as drywall primer?
      ByAug 26, 2026
      1 Answer | 
      Answer This Question

      Hi Kano! Flex Seal Liquid will not accept a topcoat once cured, so we're going to advise against using it as anything but the last layer of defense for your situation. If you have any other questions or need project assistance, please send us an email at humans@flexsealproducts.com with more details. We're always here to help.

      By|Sep 2, 2026


        Can you use this on an exterior door casing that has southern exposure that absolutely nothing else has held up and be confident that this product will? Harsh sun year round, along with freezing temps, snow and rain in the winter.
        ByAug 26, 2026
        1 Answer | 
        Answer This Question

        Hi there! Flex Seal Liquid designed to last quite some time. Longevity depends on several environmental and chemical conditions, which can be hard to identify with so many factors. In some situations, you may need to add another layer every once and a while. If you have any other questions or need project assistance, send us an email at humans@flexsealproducts.com with more details. We're always here to help!

        By|Sep 3, 2026


          is it gasoline and alcohol resistant
          ByAug 23, 2026
          1 Answer | 
          Answer This Question

          Hi there! Flex Seal Liquid designed to last quite some time. Longevity depends on several environmental and chemical conditions, which can be hard to identify with so many factors. In some situations, you may need to add another layer every once and a while. If you have any other questions or need project assistance, send us an email at humans@flexsealproducts.com with more details. We're always here to help!

          By|Sep 2, 2026


            Viewing 1-8 of 1373

            Customer Reviews

            4.3 out of 5

            • 4.3 out of 2,312 reviews
            • 83% recommend this product
            Filter by:
            Showing 1-10 of 2,312 reviews
            Don’t waste your money
            Used this pour on as well as the spray on two Rubbermaid water tanks. Did not seal whatsoever. Followed the directions but did not seal a four inch crack. These are simply large tubs of water under no pressure at all and still not able to seal. A plastic repair kit would probably work much better.
            by
            Response from Customer ServiceSep 2, 2026
            Hi. We're sorry to hear your application did not meet your project needs. We assure you, this is not the experience we want for our customers. When you get a chance, send us an email at humans@flexsealproducts.com mentioning this review. We're here to help. FlexSealProducts
              Better than expected
              We had an ongoing groundwater leak where our well pipe came brought the basement wall. Tried a number of sealers with little improvement. Applied one boat of Flex Seal right over the other applications of several different sealers overlapping the wall by 3” and the well pipe by several inches. Even with the heavy spring rains we have not seen a single drop of water leak through. Also applied Flex Seal to several wooden barrel tops that reside outdoor. It has kept the rainwater out of the winter sand/salt used on the driveway. It is quite thick so, with a little care, can be applied to vertical surfaces without running. It was well dry the touch after 4 to 5 hours. As advertised, it is a flexible rubber like product that can be brushed into uneven, rough surfaces.
              by
                worked great for my camper roof. way cheaper than any other option and way thicker than paint so less re coats and more protection. helps with hail and walnuts too since it is rubbery and flexes rather than chipping or breaking.
                by
                We used the Flex Seal to repair a rubber-backed rug. The rubber backing was breaking down and creating a rubber dust. I sealed the back of the rug with one coat to prevent additional wear and a second coat in the worn area. It may take 48 hours to fully cure as the directions state, but it works as advertised.
                by
                • Verified Purchase
                I had a dishwasher leak and used Flex Seal applying around the area (floor, side cabinets, back wall and front lip) to act as a dishwasher pan. Worked perfectly
                by
                • Verified Purchase
                Extremely thin, like water
                Not at all as thick as it is shown in the video on your website! It went on like a thin liquid, not the gel-like thickness shown in the picture. It would take a dozen coats or more to get close to the thickness shown in the video.
                by
                Response from Customer ServiceNov 17, 2025
                Hi. We're sorry to hear your application did not meet your project needs. We assure you, this is not the experience we want for our customers. When you get a chance, send us an email at humans@flexsealproducts.com mentioning this review. We're here to help. FlexSealProducts
                  1 found this review helpful
                  I Spread this one coating on my backyard block fence. Seems to keeps the leaks out. Will add another coat later
                  by
                  Was very skeptical at first with TV adds but believe me it really does work!!
                  by
                  • Verified Purchase
                  The product went on clear and dried clear. It was used to ad an extra level of protection to a waterproof sticker.
                  by
                  • Verified Purchase
                  This customer chose to rate the product and not provide text.
                  by
                  Response from Customer ServiceJul 28, 2025
                  Hi. We're sorry to hear your application did not meet your project needs. We assure you, this is not the experience we want for our customers. When you get a chance, send us an email at humans@flexsealproducts.com mentioning this review. We're here to help. FlexSealProducts
                  • Verified Purchase
                  Showing 1-10 of 2,312 reviews

                  Compare Key Features

                  current item

                  Product Snapshot

                  Ideal for sealing leaks and preventing damage with its waterproof, flexible, and UV-resistant rubber coating.
                  Ideal for sealing leaks and preventing damage with its waterproof, flexible, and UV-resistant rubber coating.
                  Ideal for waterproofing, insulating, and soundproofing, ensuring superior UV and chemical resistance for long-lasting protection.
                  Ideal for customers who want superior waterproofing, ensuring lasting UV and weather protection.

                  Waterproofing capability

                  Flexibility

                  UV Resistance

                  Temperature Range

                  Chemical Resistance