Flex Seal Reviews: Liquid Rubber Sealant

Many late nights sifting through thousands of unneeded channels can land you to a bunch of annoying infomercials where they over-exaggerate how difficult life was before their product came to fruition like the rapid ramen bowl, but sometimes there is that special one that makes you think “Hmmm, that issssss an awesome idea!”

Flex seal is a liquid rubber that comes in an aerosol spray can or gallon container which expels the liquid rubber to fix holes, cracks to seal out water or keep in the air simply by spraying, pouring, brushing or rolling the liquid rubber on with the roller. It doesn’t sag or cause dripping during the hot summer months, and it’s non-toxic. The rubber will stay pliable and flexible for many years. We’ve written out a review of pros and cons to help you make the right choice.

Quick Overview

Flex Seal Black	Flex Seal White	Flex Shot	Flex Spray	Flex Tap
Prevents rust and corrosion. Mildew and chemical resistant	Prevents rust and corrosion. Mildew and chemical resistant	Doesn’t shrink or crack vs traditional caulking	Quickly seal cracks, gutters and other small leaks fast	Instantly stop leaky pipes, hose leaks.
1 Gallon	1 Gallon	80z	10 oz	1 roll
Covers up to 100 square ft.	Covers up to 100 square ft.	Up to 50 ft.	Up to 25 square ft.	4″ x 5′
Dry Time: 2-3hrs	Dry Time: 2-3hrs	Dry Time: 20 min.	Dry Time: 2-3hrs	Instant Seal
Pour, brush, or use a paint roller	Pour, brush, or use a paint roller	Push nozzle to fill cracks, tile, fixtures	Accepts 15-Gauge nails 1″ up to 2-1/2″	Accepts 15-Gauge nails 1-1/4″ up to 2-1/2″
$$	$$	$	$	$$
(Editors Choice) Ratings: 4.4	Ratings: 4.3	Ratings: 4.0	(Great Value) Ratings: 4.1	Ratings: 4.5
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1. Flex Seal Liquid Giant (Gallon Size)

Liquid rubber in a can will stop leaks fast. It will protect your surfaces from corrosion, and you can use it on dry or wet surfaces. It will not peel or crack from the harsh winter seasons. It is incredibly versatile as it begins as a thick liquid that you’re able to roll, dip, brush, or pour on surfaces and then it magically turns into a sturdy, flexible rubber. Here are some pros and cons.

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Pros	Cons
Easy to use: Pour, Brush or roll on with roller Non-toxic, easy to use Sweeps into cracks & holes seals out water effortlessly Made to last for years a will remain flexible and pliable Won’t sag or cause dripping in summer heat, and will not crack or peel in winter cold season Stops leaks fast in their tracks	The smell is strong be sure to use in ventilated rooms

Top Questions & Answers

2. Flex Seal Spray

Here is the most common used liquid rubber sealant coating that comes in an aerosol spray can. The convenient aerosol spray allows for easy sealant applications without the need of brushes and rollers. Highly durable to seal leaks and cracks for waterproof and without sun dripping damage for many years. Here are some pros and cons.

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Pros	Cons
14 oz. Clear Liquid Rubber In A Can! You can spray on wet or dry surfaces Quickly seals out water, air, and moisture Prevents rust and corrosion Covers fast and excellent adhesion UV, mildew and chemical resistant Non-hazardous and Food Safe Will stop noise and vibrations Expands and contracts	Product can be messy 14 oz Spray is enough for just small jobs the gallon may work better for larger cracks

Top Questions & Answers

3. Flex Shot

Flex shot is the perfect solution for tight spaces – This is portability at its finest when you need to caulk around your bathtub floorboards etc. It’s really easy to use and will stop flowing the minute you release downward pressure on the bottle. Here are some pros and cons.

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Pros	Cons
Works terrific in household applications: Kitchens and baths Sinks and showers Tubs and tiles Windows and skylights Roofs and the gutters	Messy Horrible smell – use in ventilate spaces

Top Questions & Answers

Popular Ways to Use Flex Seal

• Repairing leaks and cracks to foundations and basements
• Fixing pool liners and fish ponds
• Great on flashings and chimneys
• RVs and campers
• Water and Rain barrels
• Gutters and roofs
• Tools
• Sporting equipment
• Fountains and bird baths
• Auto restoration & more!

Buyer’s Guide

Many questions surrounding flex seal get answered in our convenient buyer’s guide section so that you don’t have to scour the web looking for answers to your questions.

How to Remove Flex Seal

• Auto Finesse Obliterate
• TarX
• Sandpaper
• WD40
• Acetone

Where to Buy?

• • Amazon — It’s tough to find better prices than on Amazon.

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Many places that sell As-seen-on-Tv products should carry this rubber liquid. The places above are confirmed places of sale while their inventory last.

Does Flex Seal Work on Concrete?

Yes, it does. Clean the area of any debris and apply a thin layer and allow it to dry then add another two – three coats. Works great on concrete and adheres to everything.

How Long Does it Take for Flex Seal to Dry?

Dry time will depend on the temperature, humidity, and the thickness of the coating. The Rubber Spray will dry to the touch usually within 2 to 3-hours and in 24-hours for a full cure. It will also get much stronger over time.

What Will Flex Seal Adhere To?

It will adhere to almost any surface such as porcelain, wood, metal, tile, concrete, masonry, fabric, glass, plastic, aluminum, drywall, vinyl, rubber, cement and just about any other wet (it works best on dry and clean surfaces even though it can be used on wet surface) or dry surface.

How Much Pressure Will It Withstand?

It can handle normal rainwater and water pressure but anything intense it will not work against like fixing bike tires, the air pressure is too high.

How to Use Flex Seal?

When using the aerosol spray make sure that you shake the can well then spray the liquid rubber into small holes, cracks, or fill in leaks with a distance of 14″ from your face. Apply thin layers at a time to allow the liquid to dry fully in between applications for ultimate results. Keep the aerosol spray in temperatures that are above 60°. Once you’re finished using the spray invert the can to get a quick burst so that the nozzle is clear.

When using and storing the Gallon the rules still apply as they do to the aerosol spray such as keeping stored in rooms above 60° and not to use on high heat surfaces surpassing 350° and to apply thin layers to allow for better results. You can apply this liquid with a roller, brush or dip.

My Final Thoughts:

This is an amazing product for repairing cracks, leaks, and filling in holes and works great for a bathroom caulk. It will last for a long time to seal in moisture. Leaking gutters destroying your car rooftops can’t fight against this powerful liquid that dries into a rubber. There are so many ways to enjoy the product where others have failed such as auto restoration, fish ponds, and pool liners. Basements and foundations with the list continuing on.

The only issues we see are that you can’t use it to repair tires because of the high pressure and you can’t use it on high-temperature surfaces that exceed 350°. The other thing is the terrible smell, but if something will save you thousands of dollars in repairs something that smells foul while it dries is alright in our book but do be sure to use this product in a ventilated area. Normally we detest products found on infomercials offering you the moon and the stars, but this time maybe there is some promise. We hope we helped you decide on whether or not this product is right for your next household projects and if there’s something you want us to add to this review about your individual experience, drop us a line.