Flex Seal Power Putty Moldable Waterproof Rubber Sealant, Fills Cracks & Holes, Black, 8 oz
Flex Seal Power Putty Moldable Waterproof Rubber Sealant, Fills Cracks & Holes, Black, 8 oz
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Flex Seal Power Putty Moldable Waterproof Rubber Sealant, Fills Cracks & Holes, Black, 8 oz

|93 ratings
Flex Seal Power Putty Moldable Waterproof Rubber Sealant, Fills Cracks & Holes, Black, 8 ozFlex Seal Power Putty Moldable Waterproof Rubber Sealant Fills Cracks Holes Black 8 ozFlex Seal Power Putty Moldable Waterproof Rubber Sealant Fills Cracks Holes Gray 8 ozFlex Seal Power Putty Waterproof Rubber Sealant Moldable Fills Cracks Holes Works Underwater White 8 Oz
Actual ColorBlack

Key item features

  • Instant Sealing Power - Forms a waterproof, airtight barrier immediately with no waiting or curing.
  • 100% Waterproof, Even Works Underwater - Seals instantly on wet or submerged surfaces to prevent rust and corrosion.
  • Moldable & Flexible - Easily shaped by hand for any surface or contour without hardening.
  • Reusable & Removable - Peel off, reshape, and reuse multiple times without residue.
  • Extreme Weather Resistance - Functions in extreme heat, cold, rain, or sun. Is UV, mildew, and chemical resistant.
  • Sound & Vibration Dampening - Reduces noise, rattles, and vibrations in vehicles, appliances, and HVAC systems.
  • Paintable & Finish-Friendly - Can be painted for a seamless professional look once applied.

Specs

Industrial sealant type, Rubber SealantRec. use, Fill GapsRec location, Indoor and OutdoorBrand, Flex SealColor, BlackTransparency, Solid

About this item

Product details

Flex Seal® Black Power Putty 8oz is flexible, moldable rubberized sealant that lets you seal, secure, and protect - instantly and by hand. This non-drying, non-hardening formula forms a flexible, waterproof, and weather-resistant seal with excellent adhesion. It adheres to most surfaces, with no tools, mixing, or drying time required. Flex Seal Black Power Putty holds up in extreme temperatures and harsh conditions. It conforms to irregular shapes and surfaces, grips tight, and even works underwater, delivering all the sealing power of Flex Seal in a reusable and moldable form that won't crack or lose flexibility over time. It's more than just a putty - it's Flex Seal Power Putty, an all-purpose sealing innovation for even the toughest projects.
  • Instant Sealing Power - Forms a waterproof, airtight barrier immediately with no waiting or curing.
  • 100% Waterproof, Even Works Underwater - Seals instantly on wet or submerged surfaces to prevent rust and corrosion.
  • Moldable & Flexible - Easily shaped by hand for any surface or contour without hardening.
  • Reusable & Removable - Peel off, reshape, and reuse multiple times without residue.
  • Extreme Weather Resistance - Functions in extreme heat, cold, rain, or sun. Is UV, mildew, and chemical resistant.
  • Sound & Vibration Dampening - Reduces noise, rattles, and vibrations in vehicles, appliances, and HVAC systems.
  • Paintable & Finish-Friendly - Can be painted for a seamless professional look once applied.
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Specifications

Industrial sealant type

Rubber Sealant

Rec. use

Fill Gaps

Rec location

Indoor and Outdoor

Brand

Flex Seal

Customer ratings & reviews

4.6 out of 5 stars
stars
93 ratings93 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars73% (68)
  2. 4 stars19% (18)
  3. 3 stars6% (6)
  4. 2 stars0% (0)
  5. 1 star1% (1)
Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.
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Showing 1-3 of 93 reviews

Jun 14, 2026
Reviewer name: SarahM
5 out of 5 stars
5 out of 5 stars review

Works great for small sealing projects

[This review was collected as part of a promotion.] This is a fun product, that while I don't find myself reaching for it, when I do need it, it's very convenient and easy to use. Once you warm it up a bit by working with it, it's flexible and ready to squish into place. I like that it's removable if something needs a more permanent hold, but for things like holding on cover plates in damp environments, it works great. Also it doesn't leave a weird residue on things your hands or gloves.

Review from flexsealproducts.com
Helpful?6CQ4Y4J2XKZQ21189960693
Jun 18, 2026
Reviewer name: SonY
5 out of 5 stars
5 out of 5 stars review

My go to for quick repairs

[This review was collected as part of a promotion.] I used Flex Seal Power Putty to seal the gap around my bathtub spout, and it worked really well. It softens quickly with a little kneading, molded easily, and created a c clean, watertight seal that blends nicely with the brushed nickel. After curing, it has held up perfectly with no cracks, leaks, or peeling. For small bathroom fixed, it has been one of the most reliable options I've tried.

Review from flexsealproducts.com
Helpful?6CQ4Y4J2XKZQ21189960693
Jun 19, 2026
Reviewer name: AfshanK
5 out of 5 stars
5 out of 5 stars review

Flexible Power Putty that never dries!

[This review was collected as part of a promotion.] I received this Flex Seal Power Putty thanks to influenster for my honest review. This stuff it literally magic! Its easy to work with, mold it, shape it, seal it! It stays flexible and never dries out. It's 100% waterproof, removable, reusable and grips tight on most surfaces. This putty was a gray shade. It is so handy to have around the house and you'd be surprised how much you use it to maintain seals around the house! Grab it and keep it handy, I definitely recommend it.

Review from flexsealproducts.com
Helpful?6CQ4Y4J2XKZQ21189960693
Current price is $9.49$1.19/oz
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