Has anyone used this for roof repair? Seems to me it would work well to reseal small roof cracks.

I have not. though I have some flex seal tape.. I use Eternabond .. While I've not use flex seal tape I have used the spray for some other jobs. Works well if NOT exposed to sun. Others have said it does changes color if exposed.

I would stick with Dicor self leveling sealant and Eternabond. They're excellent products with a good track record.JMO

F4Jock wrote:Has anyone used this for roof repair? Seems to me it would work well to reseal small roof cracks.According to the TV guy, who fires cannon balls through boats, the stuff is pretty good. But, it doesn’t work for me. I once sprayed some on a new hatch cover. Thinking the cover would last longer. After about a year parked outside I could rub it off with my hand. I have seen similar results in other applications.Best use the good stuff, as gbopp suggested.

richclover wrote:F4Jock wrote:Has anyone used this for roof repair? Seems to me it would work well to reseal small roof cracks.According to the TV guy, who fires cannon balls through boats, the stuff is pretty good. But, it doesn’t work for me. I once sprayed some on a new hatch cover. Thinking the cover would last longer. After about a year parked outside I could rub it off with my hand. I have seen similar results in other applications.Best use the good stuff, as gbopp suggested.Hmmmmmm. Of course we are new at this but seems to me that every year one has to inspect and reseal parts of their roofs which leads me to wonder how good the "good stuff" really is. If I have to reseal every year it would appear that, if it works, a rubber spray would be easier, faster and less messy.

It does not stand up to the UV rays outside. We have used it for a few small outdoor projects and it usually only lasts for about 4-5 months. It works GREAT for those 4-5 months, though.We even used it to repair a commode tank and it worked great for about the same length of time, but then it eroded and started leaking again. It did help us to lengthen the time we could use the toilet and I wanted a specific replacement, so we had enough time to order one.

FlexSeal | Good Sam Community

22 Replies

Lancslad
Explorer
May 09, 2019
While camping last month a small tree branch came down and punched a hole in my fiberglass roof.I didn't realise how thin that material is, probably less than 1/8" thick. Anyway I had a tube of Flexseal so I used it to fill the hole and make it waterproof.Now we're home and I have some Eternabond tape here so tomorrow it's back up on the roof and I'll tape over the Flexseal.
mtrumpet
Explorer
May 06, 2019
gbopp wrote:
I would stick with Dicor self leveling sealant and Eternabond. They're excellent products with a good track record.
JMO

x2
MrWizard
Moderator
Apr 30, 2019
Turns a screen door into a boat
But does not say how long that boat will continue to float

Quick emergency patch, until you can do the job properly

I use Eternabond, or a good polyurethane sealant, like 3M, Dicor etc..

I don't use any flex seal products
wa8yxm
Explorer III
Apr 29, 2019
I am trying Flex Tape on an awning. NO "results" yet but I have a feeling it may work.

I have an update on teh spray on.. I used it on the windshield washer bottle on my car.. It worked.. for a while.. then it failed...

I used a different product which I use a lot of "GOOP" it is working working working.. Oh it too will chang color (Some types at least) if exposed to UV (Sun) light.. and it gets quite hard.... Eventually....
2manytoyz
Explorer
Apr 29, 2019
I've never used the spray product, but I have used the roll of peel-n-stick stuff.

In 2017, we had another hurricane do damage as it passed by our place in FL. A large branch was ripped off a tree, and it impaled my aluminum shed roof.

I removed the branch, and used a roll of the Flexseal tape.

It's been on there almost two years. The hole is still there, so there's no support for most of the material. It's still completely watertight. I did lap the material over the roof ridge to prevent water from sneaking under the top edge.

I'm sure it isn't as good as Eternabond, but I have nothing bad to say about the product. The advantage to what I bought was the 12" width. Largest I've seen with Eternabond was 5".

Now I keep this stuff on hand for other emergency patches at my house. https://amzn.to/2DBZMKg
F4Jock
Explorer
Jun 14, 2018
stvdman wrote:
I did use the Spray On FLEXSEAL. It did NOT perform well at all. I haven't tried FLEXSEAL TAPE as I have no issues with the ETERNABOND tape.

Okay. Thank you for the clarification. I have sprayed some of the joints and will keep an eye on them to see how they work out. If they don't I will go to other compounds.
stvdman
Explorer
Jun 14, 2018
I did use the Spray On FLEXSEAL. It did NOT perform well at all. I haven't tried FLEXSEAL TAPE as I have no issues with the ETERNABOND tape.
F4Jock
Explorer
Jun 14, 2018
stvdman wrote:
Tried it on my RV around a skylight..lasted 2 days. replaced with eternabond tape..still there doing its thing after a year now.

I wasn't thinking about the tape. I was referring to the spray on rubber coating that I thought would be easy to apply around the seams.
stvdman
Explorer
Jun 14, 2018
Tried it on my RV around a skylight..lasted 2 days. replaced with eternabond tape..still there doing its thing after a year now.
Bird_Freak
Explorer II
Jun 13, 2018
I tried it in a pool. It never stuck and sank to the bottom. Looked ok laying on the bottom though. Worthless to me.