Forum Discussion

Wet_Coast's avatar
Wet_Coast
Explorer
Jul 17, 2014

Flex Seal; As seen on TV, nine months later

Hi all, I thought I would post this to comment on what kind of a product Flex Seal is. I had lap seam that needed a quick fix last fall. I grabbed can of the Flex Seal. The stuff that is pumped all over the TV these days. That was October last year.

I was on the roof doing some other stuff and had good look at what's left of the Flex Seal. It's only been up there for less than 9 months. It looks like it has crystallized. Cracked and checkered and not looking like it would hold any water. It's not like it's been exposed to UV for all of that time either as the trailer sits under cover unless used a few times over the winter.

I would say don't trust the stuff for anything other than a quick fix on the road. If I can figure out how to post and link a pic, I may do it.

Rick
  • KATOOM's avatar
    KATOOM
    Explorer
    Jul 19, 2014
    The stuff thats meant for evaporative coolers works. I kinda wondered if its the same stuff as the Flex Seal but it seems you've found otherwise.
  • Ed9824v's avatar
    Ed9824v
    Explorer
    Jul 18, 2014
    DannyA wrote:
    Did not work on a plastic water tank for me.


    Not much will work on the white plastic water tanks,, But plastic welding. I made a welder from one of my dads old big soldering guns by silver soldering a copper plate to the tip and welded up my water tank so far successfully,one year and 120 gallons and holding. the only thing i would do differently next time would be to embed some metal mesh into the plastic and build it up with more polyethelene.
  • Wet_Coast's avatar
    Wet_Coast
    Explorer
    Jul 18, 2014
    Just as a follow up. I was able to remove the stuff with a heat gun and scraper. I then removed the finer film/over spray with acetone and stainless steel chore-boy.
  • edatlanta's avatar
    edatlanta
    Explorer
    Jul 18, 2014
    I had a gutter at my s&b that leaked at a couple of seams in a corner. I used 3M 5200 on the inside. It cures under water and is definitely permanent stuff. Curing takes 7 days, but since water doesn't bother the curing who cares. It has been there for almost 10 years now.

    Warning: 5200 is permanent. You can't get it off without destroying what it is attached to.
  • Bull_Rider's avatar
    Bull_Rider
    Explorer
    Jul 17, 2014
    I tried Flex Seal on a aluminum gutter corner three different times. Cleaned, wire brushed, then used lacquer thinner to prep the area. Didn't even slow down the water. Put on the applications next time, no luck. Then I cut some screen door nylon mesh and embedded that into the Flex Seal. Nope.

    Finally took it all out, which was a job, and used Sikaflex, problem solved.
  • jwoods61us's avatar
    jwoods61us
    Explorer
    Jul 17, 2014
    Not to rain on anyone's parade, but I used FlexSeal on my home gutter two years ago and it is still leak free. I did notice, however, that in the places where I put a lot of the product it did crack and crystallize just like the OP noticed. My vote is that you get what you pay for. As always, RV specific caulk works best, but a quick fix is just that.
  • 2oldman's avatar
    2oldman
    Explorer II
    Jul 17, 2014
    It's junk. I'm sure they sold enough of it to make a nice profit, then moved on to the next scam.

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