Flex Seal MAX Liquid Rubber Sealant Coating, 2.5 Gallon, Black
Flex Seal MAX Liquid Rubber Sealant Coating, 2.5 Gallon, Black
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Flex Seal MAX Liquid Rubber Sealant Coating, 2.5 Gallon, Black

448 ratings

Key item features

  • Flexible Rubber Formula: Flex Seal MAX is a 2.5-gallon black liquid rubber sealant that can be applied by brushing, rolling, dipping, or pouring. It seeps into cracks and holes, curing into a flexible, watertight coating.
  • Robust Protective Coating: Provides robust protection by sealing out water, air, and moisture, preventing rust and corrosion. It is also resistant to mildew and various chemicals.
  • Maximized Project Coverage: Offers maximum coverage and sealing power, covering up to 20% more area than the original product, providing an economical solution.
  • Diverse Repair Solutions: Ideal for fixing leaky roofs, gutters, and downspouts. It also repairs RVs, campers, skylights, vent pipes, hoses, PVC pipes, and windowsills.
  • Extensive Surface Applications: Applicable for A/C drip pans, duct work, chimneys, boats, ponds, and fountains. It repairs various roofs (metal, rubberized, granulated), foundations, and asphalt shingles.
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Specs

Adhesive form, SprayWeight, 28 lbMaterial, RubberProduct net content parent, 2.5 GallonRec location, Indoor and OutdoorRecommended surface, Rubber

About this item

Product details

When you need maximum coverage and maximum sealing power, take your projects to the MAX. Our new Flex Seal Max is our most economical option, covering up to 20% more than our original size.

Flex Seal is actually liquid rubber in a can. It sprays out as a thick liquid, seeps into cracks and holes and dries to a watertight, flexible, rubberized coating. Flex Seal coats, seals, protects and will stop leaks fast. It’s like a Handyman in a can.

Directions:

Read entire can. Wear face and eye protection, protective gloves, and clothing. Make sure the surface is clean, dry, and free of grease, oil, and dirt. Shake well. Spray 8” to 12” from surface, using an even, sweeping motion. Apply multiple, even coats until all cracks and holes have been filled.

Flex Tips:

Spray a larger area than area where the leak is and feather the edges. For best results, apply multiple coats rather than one thick coat and use at can temperatures above 60ºF. Make sure Flex Seal has filled all cracks and holes and is fully cured before testing product. If light can pass through, apply additional coats.

Flex Seal has many advantageous applications and uses, that when applied correctly, can last for many years. The most common uses for Flex Seal are: Fix leaky roofs, gutters, and downspouts, Repair RV’S, campers, and mobile homes, Repair skylights, Vent Pipes, For roof drip edges and flashings, Leaky or broken hose and PVC pipe repairs, Leaky or broken hose and PVC pipe repairs, To seal or repair windowsills, To seal or repair windowsills, For A/C drip pans, portable A/C units, duct work, and chimneys, On boats and other personal watercrafts, For bird baths, ponds, and fountains, Flat, metal, rubberized and granulated roof repairs and leaks, Foundations, gravel stops, asphalt shingles, and overlapped seams, And, much more.

  • Flex Seal Liquid is liquid rubber in a can! Now you can brush, roll, dip or pour it on!
  • Use anywhere you need a watertight, flexible rubberized coating
  • Goes on smooth and covers fast, sealing out water, air and moisture
  • Prevents rust and corrosion. Mildew and chemical resistant
info:
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Specifications

Adhesive form

Spray

Weight

28 lb

Material

Rubber

Product net content parent

2.5 Gallon

Warranty

Warranty information

1

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Warranty url

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Customer ratings & reviews

4.5 out of 5 stars
stars
448 ratings293 reviews
Includes global ratings and reviews
How item rating is calculated

Reviews summary

Pros

  • : Fills small cracks and crevices immediately.
  • : Can stretch to accommodate movement.
  • : Application process is straightforward with a brush or pouring.
  • : Forms a seal to stop leaks in various surfaces and applications.
  • : Effectively prevents water entry during rain.

Neutral

  • : Can be effective, but varies by surface type.
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Showing 1-3 of 293 reviews

May 17, 2025
Reviewer name: jimi
Item details
Color: White
Sold and shipped byNutrend Automotive Inc.
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Delivered on time

Helpful?2MK9GBITJ3H7821243511
Nov 5, 2026
Reviewer name: WalmartCustomer
Item details
Color: White
Sold bySports-Med
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Walmart had the best price of all retailers. Delivered on time.

Incentivized Review
Helpful?2MK9GBITJ3H7821243511
Aug 21, 2024
Reviewer name: Brian
Item details
Color: White
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

flex seal

quick shipping

Helpful?2MK9GBITJ3H7821243511
Current price is $203.16
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  • Free 90-day returns
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