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

130 ratings
Flex Seal Power Putty Moldable Waterproof Rubber Sealant, Fills Cracks & Holes, Gray, 16 ozFlex Seal Power Putty Moldable Waterproof Rubber Sealant Fills Cracks Holes Gray 16 ozFlex Seal Power Putty Waterproof Rubber Sealant Moldable Fills Cracks Holes Works Underwater White 16 OzFlex Seal Power Putty Moldable Waterproof Rubber Sealant Fills Cracks Holes Black 16 oz
Actual ColorGray

Key item features

  • Instant Sealing Power - Forms a waterproof, airtight barrier immediately - no waiting, no curing, no mess.
  • 100% Waterproof, Even Works Underwater - Seals instantly, even when applied to wet or submerged surfaces. Blocks water, air, and moisture to prevent rust and corrosion.
  • Moldable & Flexible - Shapes easily by hand to fit any surface or contour. Won't harden or lose tack.
  • Reusable & Removable - Can be peeled off, reshaped, and reused multiple times without leaving any residue.
  • Extreme Weather Resistance - Works in extreme heat, cold, rain, or sun. UV, mildew, and chemical resistant.
  • Sound & Vibration Dampening - Silences rattles, vibrations, and noise in vehicles, appliances, and HVAC systems.
  • Paintable & Finish-Friendly - Once applied, it can be painted to match surroundings for a seamless, professional look.

Specs

Color, GrayRec. use, Fill GapsWeight, 1.1 lbRec location, Indoor and OutdoorMaterial, Rubber-based formulationSize, 16 oz

About this item

Product details

Flex Seal® Gray Power Putty 16oz 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 Gray 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 - no waiting, no curing, no mess.
  • 100% Waterproof, Even Works Underwater - Seals instantly, even when applied to wet or submerged surfaces. Blocks water, air, and moisture to prevent rust and corrosion.
  • Moldable & Flexible - Shapes easily by hand to fit any surface or contour. Won't harden or lose tack.
  • Reusable & Removable - Can be peeled off, reshaped, and reused multiple times without leaving any residue.
  • Extreme Weather Resistance - Works in extreme heat, cold, rain, or sun. UV, mildew, and chemical resistant.
  • Sound & Vibration Dampening - Silences rattles, vibrations, and noise in vehicles, appliances, and HVAC systems.
  • Paintable & Finish-Friendly - Once applied, it can be painted to match surroundings for a seamless, professional look.
info:
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Specifications

Color

Gray

Rec. use

Fill Gaps

Weight

1.1 lb

Rec location

Indoor and Outdoor

Warranty

Warranty information

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Customer ratings & reviews

4.5 out of 5 stars
stars
130 ratings97 reviews
How item rating is calculated
  1. 5 stars72% (93)
  2. 4 stars15% (20)
  3. 3 stars8% (11)
  4. 2 stars1% (1)
  5. 1 star4% (5)

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.
  • : The putty holds up well and supports reliable repairs.
  • : Forms strong seal around small leaks and cracks.
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Showing 1-3 of 97 reviews

Sep 10, 2026
Reviewer name: Bonnie
Item details
Color: Black
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

It is strong and seals and stops leaks. Good product!!

Helpful?1FOUGAELEY5220059474409
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?1FOUGAELEY5220059474409
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?1FOUGAELEY5220059474409
Current price is $14.9993.7 ¢/oz
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