Grand Rapids (WZZM)-- Flex Seal says it's the easy way to coat, seal and stop leaks fast. It is liquid rubber in a spray can.
I tested it out with Drew Perry, a general contractor in Grand Rapids. He said, "If it works the way it says it does, it's a phenomenal product and could save people tons of money in repair costs."
We tested it first on a hole in PVC pipe. The first thing we noticed it's a gooey, black mess. It took several coats to finally cover the hole. It's also not a quick fix. It takes 2 to 3 hours to dry, and 24 hours to fully cure.
After 24 hours we noticed the Flex Seal goo ended up on the inside of the pipe, which Drew worried would contribute to clogs in your pipe work. And, when we ran water through the pipe, it still leaked. Flex Seal failed our first test.
We tried it on holes in a gutter. We poured water through the holes then immediately sprayed the Flex Seal, to test the claim it also works on wet surfaces. It actually did a good job with this test and immediately stopped the leak. The gutter test was a success for the Flex Seal.
The Flex Seal commercial really grabbed viewer's attention when they show a screen door being put on the bottom of a boat, coating the screen in Flex Seal, and showing that the boat not only floats, but stays dry. Well, I don't have that kind of budget and trust me, it would take gallons of Flex Seal to make that work, but we did do the screen test. It took several layers, but Flex Seal did hold water, not a drip came through.
So, in some cases, Flex Seal works, but it is messy, it takes time and several coats, and it may create clogs inside pipe work. It might be the quick fix you try first before spending a lot of money to repair a leak.
But just to warn you, Flex Seal is not available in stores and there are a lot of complaints online about shipping and billing costs. One can is $19.99 plus $9.95 for shipping and handling. They give you a "free" second can, but charge you another $9.95 for shipping. Your total cost for 2 cans is nearly $40!!