Flex Seal Reviews 

I use Flex Seal liquid for my basement a bunch of garbage doesn't work I wasted my money

Tried TWICE! Both times product had never been opened but was hard as a rock. Expensive stuff was worthless. Shameful - FlexCrap and Lowe’s in Germantown Tn

I use flex seal as instructed. Clean dry surface. Application time between coats. Proper cure time. I used flex seal on my filter basket in my hot tub. Waited a week to make sure it was cured completely. Have you used my hot tub a week now and the flex seal has turned into a soft liquid garbage! My hot tub did not leak at first but now it does again! Thank you Phil Swift! You didn't make a boat out of the damn stuff and leave it in the dark for overnight. Very misleading! Phil

Didn't know you can't paint over this until after I applied to cracks on my outside stucco walls. Had to use a rotary steel brush to remove it's so I could paint. Wasted money and not for use in areas that you have to paint over it

Well just bought a gallon $111.00 of liquid Flex seal to seal my cellar cinder block wall. It sucks as most of what I used ended up on my floor. Now I can't paint over it with concrete water proof paint. Thanks Flex seal.

The FLEX SEAL LIQUID ONLY COME IN THREE COLORS AND CANNOT BE PAITED OVER ONCE APPLIED - I is a total waste of money and costly !!

Flex seal is not easy to apply. I bought the small tub container. After use I sealed it up as instructions started. It dried out and was hard as a rock when I went to use again. The ads are extremely false about this produce. For the price you would think it would last longer than one use before drying out and become rock hard and useless. I feel ripped off to say the least.

The product does not perform as advertised. I used it to seal a plastic trash can lid and within a month it failed and did not retain its integrity

Flex paste has worked great for me but the packaging leaves a lot to be desired. Though it’s “sealed” in a tube, most tubs do not seal out the air. One I purchased had over an 1” of product that was hard as a rock. I think all the tubs should be shrink wrapped, would be worth the extra cost just to get complete product as advertised.

Tried this on my bird bath ,does Not work ,total waste of my money.

Flex seal is the best we did our roof and when our neighbors home burnt our home down guess what the flex seal roof was still standing its very good stuff and you have to coat it a couple times but it works well

A can of the flex seal spray exploded in my laundry room during the night. it was on the wall, dripped down unto my new floor...Covered many of my products I had to throw out.
what a nightmare to cleanup!

CAUTION!!!!

My Review of flex seal spray and flexseal Can.
I own a machine shop machineandtoolservices.com

I bought a small cnc mill, but it needed coolant, the coolant tank was leaking in many places, I applied both, can of seal and spray seal, (a must let it sit and cure between layers, i used 3 layers) after a few days i put water in it and tested it for 5 hours, and no leak.

My band saw needed a coolant tank too, so i made a wooden box 1/2"thick wood 3ft x 2ft x 4inch wall height, then applied flex seal, both spray and brush on, focusing on the most likely leak areas, with thicker coat, and again no leaks.

Do not brush over large gaps and holes, cover first with fibre glass mesh or thin wood then brush on Flex seal.

It's a no brainer Flex Seal works, if you do it right.
I will be posting some youtube videos of my CNC Mill
and Band Saw running flood coolant.

Ps, Be patient let it cure and dry for 3days or more,
give the rubber a chance to expand into the grooves and small crevices.

Any questions just text me Machineandtoolservices
web site.

Flex seal tape is totally false advertised. It did not work. I tried to seal a needle size hole from leaking but it did not seal at all. This tape is just like any other tape useless. I contacted company about their guarantee they ignored me

25 percent of product was hard in 2 containers 1 container was hard throughout

this product does not work AT ALL. Do not waste your money. it did not even seal a hair line crack on a pipe.

Ok, lets get real this product does work, but you may have to do a little extra on your part depending on what your using if for. I could not not afford to water proof my basement at the cost of 40.000 with the company I will not mention, not trying to take business away or put them in a bad light but I use Flex Seal to do my whole basement yes it was time consuming but I put a little more work into it before using Flex Seal I sanded and cement the walls first, than a week later I use the all white Flex Seal to paint over the cement I rolled it on thick the first and only time so I would have a nice thick layer and it may have taken me 2 months to finish but it looks good. I love my concrete walls and now there white and rubbery nice to the touch, its one year now and no leaks. So people before you trash a product be mindful on how you use it and the steps you take before use. This product does work!

Purchased a small tub of Flex Seal Black Paste -- When I opened, it had already solidified around the edges -- Was able to use some from the middle by penetrating with a screw driver, but within three days, even after covering the tub with lid tightly and putting in a plastic bag, it had hardened too much for use-- Could not evaluate the product since I was not able to get enough to fill my problem area.

Garbage! Wouldn't stick. Top layer dried out and hard. Flex Seal got me this time but never again!

I paid a small fortune for a 4oz tube of the glue. And when I opened it the glue was no good.