Flex Seal Power Putty Moldable Waterproof Rubber Sealant, Fills Cracks & Holes, Black, 16 oz
Flex Seal Power Putty Moldable Waterproof Rubber Sealant, Fills Cracks & Holes, Black, 16 oz
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Flex Seal Power Putty Moldable Waterproof Rubber Sealant, Fills Cracks & Holes, Black, 16 oz

107 ratings
Flex Seal Power Putty Moldable Waterproof Rubber Sealant, Fills Cracks & Holes, Black, 16 ozFlex Seal Black Power Putty 16ozFlex Seal White Power Putty 16ozFlex Seal Gray Power Putty 16oz
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.

About this item

Product details

Specifications

Customer ratings & reviews

4.6 out of 5 stars
stars
107 ratings94 reviews
How item rating is calculated
  1. 5 stars74% (79)
  2. 4 stars18% (19)
  3. 3 stars7% (7)
  4. 2 stars0% (0)
  5. 1 star2% (2)

Reviews summary

Pros

  • : Molds into tight spaces with a smooth consistency.
  • : Effective for quick fixes and small repairs on various surfaces.
  • : Has faint or no noticeable scent during use.
  • : Simple to use and apply without complexity.
  • : Forms strong seal around small leaks and cracks.
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Showing 1-3 of 94 reviews

Aug 15, 2026
Reviewer name: JanetteW
5 out of 5 stars
5 out of 5 stars review

Prefect to have around if you need a quick fix

[This review was collected as part of a promotion.] This worked great for a repair on my saltwater fish tank. It was easy to use, molded exactly where I needed it to, and made a good seal when it cured. I appreciate products like these because you never know when you're going to need it. It's still holding up without issues.

Review from flexsealproducts.com
Helpful?1FOUGAELEY5220132406403
Aug 9, 2026
Reviewer name: JAYMEJ
5 out of 5 stars
5 out of 5 stars review

Awesome water tight putty

[This review was collected as part of a promotion.] This putty works so well. I used it under my sink on the seams for the pipes. I had a leak. We put some of this on, and no more leak. It has been a month, and no leaks, and no reapplication needed. I highly recommend.

Review from flexsealproducts.com
Helpful?1FOUGAELEY5220132406403
Jul 11, 2026
Reviewer name: RachaelD
5 out of 5 stars
5 out of 5 stars review

Super simple repairs.

[This review was collected as part of a promotion.] The Flex Seal Power Putty was easy to apply and had a smooth, workable consistency that made filling gaps and cracks simple. It has very little odor & dries into a durable finish. Great product to keep on hand for quick household fixes.

Review from flexsealproducts.com
Helpful?1FOUGAELEY5220132406403
Current price is $14.9993.7 ¢/oz
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