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Flex Paste, Half-Quart, White, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs

4.0 out of 5 stars 2,870 ratings
$14.87 $0.93 per ounce
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Color: White
Size: No Size
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Purchase options and add-ons

Material Rubber
Brand Flex Paste
Style 1 lb White
Item Weight 1 Pounds
Item dimensions L x W x H 4.25 x 4.25 x 2.5 inches

About this item

  • NEW! STAY FRESH CONTAINER – Blocks out air and locks in freshness to extend the sealing power of Flex Paste, with no waste
  • COAT, SEAL & PROTECT - Penetrates deep to seal out air, water, and moisture. Once dry, it turns into a strong, flexible, watertight, rubberized barrier
  • WORKS UNDERWATER - Can be applied underwater, and it even dries underwater
  • FILLS LARGE AREAS - Super thick rubber paste clings to the surface and instantly fills large gaps, cracks, and holes
  • FULLY PAINTABLE - Once fully cured, it can be painted any color. Helps prevent rust and corrosion, and it is UV resistant
  • EXCELLENT FOR – filling cracks and holes, foundation and concrete repairs, sealing out rodents and pests, bath and shower, indoor and outdoor projects, roof, RV, motorhome, auto, marine, lawn and garden projects, DIY, hobbies, and more
  • MADE IN THE USA
› See more product details

Additional Details

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$15.99 ($0.12/fluid ounce)

Frequently bought together

Flex Paste, Half-Quart, White, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air
This item: Flex Paste, Half-Quart, White, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs
$14.87 ($0.93/ounce)
Get it as soon as Tuesday, May 6
In Stock
Ships from and sold by Amazon.com.
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Flex Tape, 4 in x 5 ft, Gray, Original Thick Flexible Rubberized Waterproof Tape - Seal and Patch Leaks, Works Underwater, In
$14.99 ($2.68/ounce)
Get it as soon as Tuesday, May 6
In Stock
Sold by Flex Seal Products and ships from Amazon Fulfillment.
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Flex Caulk, Waterproof & Weatherproof Hybrid Polymer Sealant, Strong, Paintable, Indoor, Outdoor, Bath, Shower, Sink, Window,
$19.87 ($3.01/fluid ounce)
Get it as soon as Tuesday, May 6
In Stock
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Total price: $00
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Product details

  • Product Dimensions ‏ : ‎ 4.25 x 4.25 x 2.5 inches; 1 Pounds
  • Item model number ‏ : ‎ FLEX SEAL - PFSWHTR16 - WHITE
  • Date First Available ‏ : ‎ February 14, 2020
  • Manufacturer ‏ : ‎ Swift Response, LLC
  • ASIN ‏ : ‎ B084TDJLKT
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.0 out of 5 stars 2,870 ratings

Product Description

Flex Paste

Flex Paste

Works indoors and outdoors.

Penetrates deep to seal out air, water, and moisture. Once dry, it turns into a strong, flexible, watertight, rubberized barrier.

Flex Paste Clear

Apply to almost any surface.

Use on: Wood, glass, tile, concrete, aluminum, metal, brick, stucco, masonry, PVC and so much more.

Flex Paste

Clings to wet and dry surfaces. Even underwater.

No need to wait for surfaces to completely dry before sealing them. It even cures underwater.

Flex Paste

Can be spread, shaped, and formed.

This thick rubberized paste is exceptional for all types of crafts, hobbies, and more.

Flex Paste

Won’t shrink, crack, or become brittle.

Flex Paste stays completely flexible, making it perfect for all-season roof repairs and all types of DIY projects.

Made in USA

Made in the USA

Flex Paste is proudly made in America, using globally sourced products.

DIRECTIONS:

Remove even layer

Using putty knife, trowel or similar tool, remove an even layer from the top surface.

Do not scoop

Do not scoop deeply into the tub as this may create air pockets.

Apply a generous amount

Apply a generous amount to the surface using a smooth motion.

Test after product has cured

Always make sure all cracks & holes have been completely filled & cured before testing.

Flex Paste

What's in the box

  • Household Item

    • Customer reviews

    4 out of 5 stars
    2,870 global ratings

    Review this product

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    Write a customer review

    Customers say

    Customers report mixed experiences with the sealant's functionality, with some saying it works well while others find it completely unusable. The product's hardness receives mixed feedback - while some find it solid once dried, others report it becomes hard and unusable. Additionally, the product dries quickly inside the jar, and while some say it works well to stop leaks, others report it still leaks.

    AI-generated from the text of customer reviews

    Select to learn more

    137 customers mention "Functionality"79 positive58 negative

    Customers have mixed experiences with the sealant's functionality, with some reporting excellent results while others find it unusable and consider it a waste of time and money.

    "...repaired a fiberglass bathtub, it was thick, I globed it on and to worked good, my can was air tight and fresh, not permanent but long lasting patch..." Read more

    "Unfortunately, upon opening the plastic container, only half was usable as the outer sides of the container were hard and unusable...." Read more

    "This stuff works great. Used it to seal some cracks in a basement wall where I had water coming in...." Read more

    "...Once it was ready, this magical black goo did an incredible job! No more leaks, and my pond is now a happy home for my fishy friends...." Read more

    90 customers mention "Hardness"33 positive57 negative

    Customers have mixed experiences with the sealant's hardness - while some find it solid once dried and suitable for heavy-duty use, others report that it is very hard to work with.

    "...the plastic container, only half was usable as the outer sides of the container were hard and unusable...." Read more

    "...good, my can was air tight and fresh, not permanent but long lasting patch, don't get it on your clothes,,," Read more

    "I'd have returned this product if time had allowed. The top 1" was rock hard and completely dried out...." Read more

    "...After the first uses the product gets hard. No matter how you close and store the product the product gets hard and is unusable...." Read more

    38 customers mention "Leak prevention"18 positive20 negative

    Customers have mixed experiences with the sealant's effectiveness, with some reporting it works well to stop leaks, while others mention it still leaks through.

    "...Once it was ready, this magical black goo did an incredible job! No more leaks, and my pond is now a happy home for my fishy friends...." Read more

    "...This Flex Paste is JUNK!!!! Had a very small leak at the base of this water faucet (small droplets of water on the PVC surface)...." Read more

    "Worked great to fix my leak. unfortunately the product must have a shelf life...." Read more

    "Sun roof was leaking between the glass and the seal. The seal is no longer available...." Read more

    58 customers mention "Dries quickly"15 positive43 negative

    Customers report that the sealant dries out quickly, particularly noting that it quickly absorbs moisture inside the jar and becomes unusable like wet chalk.

    "...The top 1" was rock hard and completely dried out. I had to break through the top layer to get to usable product...." Read more

    "...to then use that to bridge more over, but then found the top layer in the tub also dried and wasted a fair amount of what remained even when doing..." Read more

    "...This stuff is amazing! It sticks to virtually ANYTHING, dries very fast, and is very solid...." Read more

    "...The product was dried out across the top and about a half-inch down upon arrival. I had to remove the dried product to access what was left...." Read more

    Time will tell
    5 out of 5 stars
    Time will tell
    I have used Flex Seal paste in household projects over the past few years and had extreme success. Over the past month I removed cleaned and reseated 14 Portlights, and 4 Deck hatches on my sailboat. I have full confidence that this will last long into the future. The price was a 50% of the previous 3m products I have used in the past. It may be over kill but I used 12 tubes for my project. I used the RYOBI battery powered caulking gun, which made it very easy and controllable. I then used my fingertip (rubber gloves) for smoothing. I continually sprayed my gloved fingertip with alcohol and smoothed to a perfect finish. NOTE: I took the above pictures before trimming and smoothing the Flex Paste.
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    Top reviews from the United States

    • Luckyduck
      5.0 out of 5 stars Good stuff, simple to use
      Reviewed in the United States on April 18, 2025
      Color: WhiteSize: No SizeVerified Purchase
      I was worried bjt, it worked I repaired a fiberglass bathtub, it was thick, I globed it on and to worked good, my can was air tight and fresh, not permanent but long lasting patch, don't get it on your clothes,,,
      One person found this helpful
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    • Amazon Customer
      5.0 out of 5 stars Works great.
      Reviewed in the United States on April 5, 2025
      Color: WhiteSize: No SizeVerified Purchase
      This stuff works great. Used it to seal some cracks in a basement wall where I had water coming in. The only thing I didn’t like is the can it’s put in. It’s hard getting out the material because of the lip for the lid. Previous version I used was in a plastic container and it was much easier to remove the material from the container. Otherwise this stuff works really well.
      3 people found this helpful
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    • Nina
      4.0 out of 5 stars To work
      Reviewed in the United States on April 26, 2025
      Color: WhiteSize: 9 OuncesVerified Purchase
      Is ok
      Helpful
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    • Carroll S
      1.0 out of 5 stars Does NOT work as advertised!!!
      Reviewed in the United States on October 28, 2024
      Color: WhiteSize: No SizeVerified Purchase
      UPDATE - I have been monitoring the pipe for the last few days. While I initially thought the paste was going to provide the fix I needed, that "thought" would be incorrect. The water started leaking again. Be smart/save your money and do not buy this stuff. I'm going back to what I should have done to start with - turn off the water and replace the pipe. This Flex Paste is JUNK!!!!

      Had a very small leak at the base of this water faucet (small droplets of water on the PVC surface). Based on the advertisement I thought the paste would be the perfect fix. I followed the directions as stated on the container. After apply a good initial coat, I still had the small leak. The next day, I applied another coat - still had the leak. The next day, after turning off the water to everything, I applied another coat heavy/massive amount of paste using both a putty knife and my hand. Left the water off for 1 to 2 hours and the leak appears to have stopped (after using most of the paste). What a pain!!!
      While using the paste, I was diligent in keeping the lid on the paste. At the end of each day, I would use a rubber mallet to hammer the lid on. Regardless of the tight seal, the paste still hardened.
      Probably would have been easier to just replace the bad piece of PVC that was leaking.
      Customer image
      Carroll S
      1.0 out of 5 stars
      Does NOT work as advertised!!!

      Reviewed in the United States on October 28, 2024
      UPDATE - I have been monitoring the pipe for the last few days. While I initially thought the paste was going to provide the fix I needed, that "thought" would be incorrect. The water started leaking again. Be smart/save your money and do not buy this stuff. I'm going back to what I should have done to start with - turn off the water and replace the pipe. This Flex Paste is JUNK!!!!

      Had a very small leak at the base of this water faucet (small droplets of water on the PVC surface). Based on the advertisement I thought the paste would be the perfect fix. I followed the directions as stated on the container. After apply a good initial coat, I still had the small leak. The next day, I applied another coat - still had the leak. The next day, after turning off the water to everything, I applied another coat heavy/massive amount of paste using both a putty knife and my hand. Left the water off for 1 to 2 hours and the leak appears to have stopped (after using most of the paste). What a pain!!!
      While using the paste, I was diligent in keeping the lid on the paste. At the end of each day, I would use a rubber mallet to hammer the lid on. Regardless of the tight seal, the paste still hardened.
      Probably would have been easier to just replace the bad piece of PVC that was leaking.
      Images in this review
      Customer image
      7 people found this helpful
      Helpful
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    • Donna Duhe
      5.0 out of 5 stars Amazing product
      Reviewed in the United States on February 5, 2024
      Color: WhiteSize: No SizeVerified Purchase
      Unfortunately, upon opening the plastic container, only half was usable as the outer sides of the container were hard and unusable. So, As much as I Love this product,, because of the price, and I only could use half of my purchase , I will not buy again.
      16 people found this helpful
      Helpful
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    • Albacore Shuffle
      3.0 out of 5 stars Seems to work.
      Reviewed in the United States on September 18, 2024
      Color: WhiteSize: No SizeVerified Purchase
      I'd have returned this product if time had allowed.
      The top 1" was rock hard and completely dried out.
      I had to break through the top layer to get to usable product.
      It did stop the leak.
      I'd have given 5 stars if 1/4 of the product wasn't dried out.
      2 people found this helpful
      Helpful
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    • Gregg
      5.0 out of 5 stars Easy to use
      Reviewed in the United States on March 27, 2025
      Color: WhiteSize: No SizeVerified Purchase
      Perfectly seals
      One person found this helpful
      Helpful
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    • Fox shopper
      5.0 out of 5 stars Stop the leak with this stuff
      Reviewed in the United States on March 23, 2025
      Color: WhiteSize: No SizeVerified Purchase
      Rv repair essential. Fixed the leak.
      One person found this helpful
      Helpful
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    Top reviews from other countries

    Translate all reviews to English
    • Nikki89
      5.0 out of 5 stars Really good!
      Reviewed in Canada on March 22, 2025
      Color: BlackSize: No SizeVerified Purchase
      My cars roof has some pretty bad rust, finally it started to leak. So before winter came I decided to seal it up with this. To my surprise it works really well lol… not the best thing to use on your roof, but it’s the quick and easy repair for an older car. Not the way I wanted to repair it, but it does the trick for now!
      Report
    • Teresa Galena
      5.0 out of 5 stars Works great
      Reviewed in Canada on March 5, 2024
      Color: WhiteSize: No SizeVerified Purchase
      Easy to use works great
      Report
    • Greg Ritchie
      5.0 out of 5 stars Strength and easy to apply
      Reviewed in Canada on April 16, 2025
      Color: BlackSize: No SizeVerified Purchase
      Best product for my inside mud guard repairs. Stronger than black ext caulking that ai used last time.
      Report
    • Don Chapman
      1.0 out of 5 stars unuseable
      Reviewed in Canada on September 13, 2024
      Color: WhiteSize: No SizeVerified Purchase
      It came to me dry and had to thin it out .
      Report
    • Lea
      1.0 out of 5 stars Not good quality
      Reviewed in Mexico on November 25, 2024
      Color: WhiteSize: No SizeVerified Purchase
      Lo pedimos hace 11 meses y lo abrimos ayer. ¡Fue difícil! No pudimos usarlo. Veo muchas reseñas que dicen lo mismo.
      Report