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Flex Paste Black 3 lb Super Thick Rubber Paste

You can apply it directly to wet surfaces or underwater to stop leaks immediately.

Works Even Underwater

The super thick paste clings to surfaces to seal large cracks and holes instantly.

Fills Large Gaps

It dries into a flexible rubber coating that seals out moisture, air, and water.

Blocks Water And Air

Once fully cured, you can paint over the seal to match your surface.

Paint Any Colour

<ul><li>Coats and Seals: Penetrates deep to seal out air, water, and moisture, drying into a strong, flexible, watertight, rubberized coating.</li><li>Underwater Application: Can be applied and dries underwater.</li><li>Fills Large Gaps: Super thick rubber paste that clings to surfaces and instantly fills large gaps, cracks, and holes.</li><li>Paintable and Protective: Once fully cured, it can be painted any color and is UV resistant, helping prevent rust and corrosion.</li><li>Versatile Surface Adhesion: Works on wood, glass, tile, concrete, aluminum, metal, brick, stucco, masonry, copper, fabric, fiberglass, ceramic, porcelain, natural stones, roofing, PVC, EIFS, EPDM, CSPE, Hypalon polyurethanes.</li></ul>

RECOMMENDED SURFACES – Wood, Glass, Tile, Concrete, Aluminum, Metal, Brick, Stucco, Masonry, Copper, Fabric, Fiberglass, Ceramic, Porcelain, Natural Stones, Roofing, PVC, EIFS, CSPE, EPDM, Hypalon Polyurethanes, and so much more. <ul><li>Made in The USA</li><li>COAT, SEAL & PROTECT- Penatrates deep to seal out air, water, and moisture. Once dry, it turns into a strong, flexible, watertight, rubberized coating</li><li>WORKS UNDERWATER- Can be applied underwater and it even dries underwater</li><li>FILLS LARGE AREAS- Super thick rubber paste that clings to the surface and instantly fills large gaps, cracks and holes</li><li>PAINT OVER IT- Once fully cured, it can be painted any color. UV resistant. Helps prevent rust and corrosion</li><li>EXCELLENT FOR– cracks & holes, foundation & concrete, bath & shower, indoor and outdoor projects, roof, RV, motorhome, auto, marine, lawn & garden projects, DIY, hobbies, and much more</li></ul>

Industrial Sealant Type

Recommended Surface

Recommended Location

Brand

Colour

Volume Capacity

Material

Assembled Product Weight

Size

Has Written Warranty

FLEX PASTE™ is a super thick rubberized paste that you can spread, shape, form, and seal virtually everything. It starts as a thick paste and dries to a strong, flexible rubber coating that can be applied to all types of surfaces to seal out air, water and moisture. It clings to the surface and instantly fills large gaps, cracks, and holes. It won’t shrink or wash away and can be painted any color. It can be applied on dry or wet surfaces, even underwater! Available in white and black. It's perfect for fixing cracks and holes, foundation and concrete repair, sealing out rodents and pests, bath and shower repair, indoor and outdoor projects, roof repair, RV and motorhome repair, auto repairs, boat repair, lawn and garden projects, and so much more! Works on wood, glass, tile, concrete, aluminum, metal, brick, stucco, masonry, copper, fabric, fiberglass, ceramic, porcelain, natural stones, roofing, PVC, EIFS, EPDM, CSPE, Hypalon polyurethanes, and much more.

Manufacturer Part Number

Assembled Product Dimensions (L x W x H)

Universal Product Code (UPC check)

Walmart Item #

fulfillment

title_shipToHome_date_delivery

Actual Color

Black

WHITE

White

4 in x 4 in

5.25in

9 oz

MAX 12 lb

Ease Of Use

Paste Consistency

Leak Sealing

So for 9 years I've been trying to seal my back sun porch which has an aluminum roof. My son and i coated it 4 times, I had a contractor coat it twice and I coated it another 4 times last Spring.  But it still leaked and got considerably worse as time went by.  I thought, what the h%$l, let's give it a try im running out of options.  I sealed the roof prior to a storm so i could get a good test of the seal and NOT 1 DROP! I can't believe it! Although it's only been a month i feel it did the job, time will truly tell but i couldn't be happier.

Amazing!

flexsealproducts.com

I purchased the flex paste to close open ends in my deck railing which is 1  1/2" pipe.  your product was fresh and I used a butter knife to do the job.  I was able to clean the knife and my hands afterward ...it worked perfectly and I still have some I am saving for any leaks that should arise.

Buy from Mfg for fresh product and low price

It does all it says it can do.  I have had leaky skylights for over a year and have tried various ways to stop the leak.  Need I say more?  Flex Paste sealed them up.  I am going to get two more tubs of it, just to even out the job, now that the first application has set.

Flex Paste Works

As the title says it works exactly as advertised, but ... it comes pourly packaged and when you open a can, you'll find approximately 20-30% of its content completely dried out and therefore unusable. That is a shame, because I really liked this product after it has been applied. I wish FlexSeal figured out how to prevent it from drying out while it sits on a shelf.

It works as advertised, but ...

Two different uses of the Flexseal paste I have never seen advertised.  
1)  I have used Flexseal to repair bicycle inner tube punctures rather than a cheap patch.  Normal prep of the tube and a coating if the paste is all that's required tor an air tight seal and no issues.  As a competitive cyclist, I have lots of training rides in less than ideal conditions resulting in several punctures. I'll usually collect several tubes and spend very few minutes affecting the repairs.

2)  I'm currently replacing pool decking and installing composite decking over a concrete and paver pool deck.  Over time, the pool deck has shifted and cracked and the surface is uneven and broken in places.  I use Flex seal to help anchor the ends of the composite decking to the existing surface to keep the surface level and secure.  Works well.

Flex seal has a new purpose (or two)

It works as described to use under water . But I warn anyone trying to use this product in their Koi fish pond.. Do not use!  I attempted to use this to stop a leaky water skimmer. Although, so far my fish seem unharmed, Flex Paste leaves a large oily film on top of the water. It is virtually impossible to get rid of without fully draining and washing your pond out.

No good for koi ponds!

It does not stick on wet surfaces as started in the ads. I bought it to fix a leaking foundation wall, but did not stopped the low flowing water.

No satisfied with product

I have used this product before - and I will use it again.  However, this order arrived with the top 1/3 of the product already set.  I had to pry the set material out with screwdrivers to get to the "good", unset material.  I was in the middle of a project, tools and pumps around, so returning the order for replacement was not reasonable.  Very annoying and frustrating.  Many bad thoughts were had by me.

A very bad day, product or packaging was defective

Garbage product. The paste is hard as a rock and completely unusable.

Stay away from this stuff

Didn't work on sealing fiberglass roof leaks after spending on 3 of these containers which aren't cheap

Not happy

FLEX PASTE BLACK 3 LB super thick rubberized paste in a red and yellow metal can with black lid, seals out water, air, and moisture to create a waterproof barrier, features bilingual English-French text, a blue water droplet graphic, and a stay fresh container label, made in the USA, suitable for concrete, foundation, and outdoor repairs.