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💧 Seal it once, seal it right — Flex Seal Liquid keeps your world watertight!
Flex Seal Liquid is a premium liquid rubber coating that provides a flexible, breathable, and UV-resistant waterproof seal. Ideal for a wide range of surfaces including roofs, basements, RVs, and marine applications, this 2.5-gallon white sealant offers fast coverage and long-lasting protection against water, rust, and corrosion.












| ASIN | B0916SLFH1 |
| Best Sellers Rank | #45,986 in Automotive ( See Top 100 in Automotive ) #78 in RV Sealants |
| Brand | Flex Seal Liquid |
| Brand Name | Flex Seal Liquid |
| Color | White |
| Compatible Material | Concrete |
| Customer Reviews | 4.5 out of 5 stars 134 Reviews |
| Global Trade Identification Number | 00850017897441 |
| Included Components | Item |
| Item Dimensions | 10.5 x 10 x 10 inches |
| Item Form | Liquid |
| Item Type Name | Flex Liquid MAX - White 2.5 Gallons |
| Item Weight | 28 Pounds |
| Item dimensions L x W x H | 10.5 x 10 x 10 inches |
| Manufacturer | Swift Response, LLC |
| Material | Rubber |
| Material Type | Rubber |
| Model | LFSMAXWHT02 |
| Number of Items | 1 |
| Part Number | LFSMAXWHT02 |
| Style | Liquid Rubber |
| Style Name | Liquid Rubber |
| Surface Recommendation | Roof |
| UPC | 850017897441 |
| Unit Count | 320.0 Fluid Ounces |
| Warranty Description | 1 Year Limited |
| Water Resistance Level | Waterproof |
P**O
Sturdy, resilient, reliable
Amazing product, I've been using so many other brand names for roof sealant, and this was the only product that allowed me to fully fix my roofs leak-free. It's been almost a year and it's still very study and waterproof. All type of weather here, storms, hurricanes, snow, heat from direct sunlight, etc, and this product still keeps the roof nice and clean.
J**N
It works for me
So I bought this for my rv leak. I have an older rv model from the 80s it has a tin roof. So i bought two buckets of this for my 27 foot rv. I will state that it only took one bucket. I will state that I put 3 layers of this paint on my rv roof and sealed it up just fine. The suggestion I will make is dont use a paint tray with it. as the paint will stick to it and youll never get the tray back once it does lol. I suggest you use a paint tray insert instead. Also i suggest you buy a larger paint roller. it will save you time. also youll need multiple layers on the roof and each layer needs to dry. those rollers will dry fast. so expect to buy at least 3 of them. I suggest getting small brushes for detailed work or nooks and crannies. All in all youll be looking at roughly 600 bucks invested in a rv roof sealing project of my sized rv.
J**N
Great stuff!
Used on several roof tops on RVs, flex is a cost effective alternative to very costly repairs. Was quoted over 5k to replace the roof and only options for colors were tan, grey, or black, and; well it doesn't take a genius to understand that those colors tend to absorb the sun and cause for breakdown of the material. If I was to spend 5k I would want the material white. Didn't have 5k or consider it anymore after the color options offered. This pail was not bad priced and one did two coats on my cleaned roof, 37ft long 8ft wide. I have noticed it not as hot in my trailer and ac kicks on about 3x less than before. Very happy with how it turned out and will plan on doing another pail just for peace of mind.
J**E
The product is easy to work with and it keeps out the water!
I looked at a number of different products to use on the roof of my RV. It is an older RV, 1985 and other owners had removed air conditioner and roof vent. The patches were poorly done, and were done with various materials. I decided to go with Flexseal having used the product for other purposes and being satisfied. When I was on the roof I noticed a weak spot with the material being broken in several places. I decided to use a piece of roofing metal and cut it to size. I then used construction adhesive to glue it to the roof. I placed weights around the edges to get a tight patch. I then applied the Flexseal over the patch. Totally on the patch I put three coats and put extra on the edges of the patch. I purchased the 2 1/2 gallon size and I was able to cover the roof two times with material left over. It is a class C motorhome measuring 25 feet. For the first coat I used a roller for the center and a 3 inch short bristle brush for the edges and around fittings. The roller leaves a little thinner application so I used the brush only on the second coat. Each dip of the brush only covered a 6 inch by 6 inch area but I was able to apply it thicker. There have been several hard rains since it was applied and there are no leaks. I am pleased with the product and would recommend it.
J**.
Good buy
Good product, Need to set up fast...
A**R
Flex seal
Worked great to seal my & my brothers roofs on our 23 ft trailers. Works amazing so far. I would recommend to anyone that needs to seal there rv roofs.
B**A
Ease of use, fantastic sealant, lived up to the hype 😊
This is Fantastic…brightens the room, water sealant 👍, No more bugs 👏👏👏 . Pretty easy to use. Great purchases
K**N
Overall I love the coverage. If you want your wall white it’s great! Cannot paint over this stuff
Dislike- you cannot paint over it. Does allow tear drops of rain to come through but not running water. Like-provides great coverage and looks clean. It doesn’t cure dry on the inside of the basement like it does the outside so unsure how long in a moist basement it will take to fully set. Only time will tell. Overall great product. Easy to use
Trustpilot
2 months ago
4 days ago