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Old 03-20-2021, 02:22 PM   #1
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Flex Seal instead of Lap Sealant?

Has anyone tried white Flex Seal instead of the standard lap sealant on any of your roof penetrations? I did a search and did not find any posts about it. It is a PIA to clean and re-do the lap sealant in those tight areas every 2-3 yrs. especially here in FL. I have Eternabond tape on most of the more or less straight seams and it is a do it once and it is done.

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Old 03-20-2021, 03:36 PM   #2
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I think you're better off with Eternabond than Flex Seal.

Flex Seal is really permanent. Sure no maintenance but if you ever have to replace something you'll probably have to replace the roof.

So I'd vote no for Flex Seal on the roof.
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Old 03-20-2021, 04:09 PM   #3
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I guess as long as you recognize it's permanence:
It's kind of nice to know that it works as advertised.
Eternabond is also pretty dang permanent also...
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Old 03-20-2021, 04:09 PM   #4
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I was thinking about cleaning the lap sealant as usual and applying Flex Seal on top, see if it would fill the cracks and provide a seal over the lap sealant. Of which there is at least one layer, maybe two. Although, when cleaning the old lap sealant a good bit of it is dissolves using a stiff brush, mineral spirits and finishing up with 90% alcohol.
Then again, if the lap sealant base starts cracking more, not sure the Flex Seal would hold up. May just try it on the sewer vent pipe and see how it goes since it is small and good for a test site. If the base lap sealant cracks open or something does not work out, it would be an easy fix.
Thanks for the info as I have never used Flex Seal; just seen and read about the hype with the guy that gets all excited in the ad.
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Old 03-20-2021, 04:32 PM   #5
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Quote:
Originally Posted by mcr1010 View Post
I was thinking about cleaning the lap sealant as usual and applying Flex Seal on top, see if it would fill the cracks and provide a seal over the lap sealant. Of which there is at least one layer, maybe two. Although, when cleaning the old lap sealant a good bit of it is dissolves using a stiff brush, mineral spirits and finishing up with 90% alcohol.
Then again, if the lap sealant base starts cracking more, not sure the Flex Seal would hold up. May just try it on the sewer vent pipe and see how it goes since it is small and good for a test site. If the base lap sealant cracks open or something does not work out, it would be an easy fix.
Thanks for the info as I have never used Flex Seal; just seen and read about the hype with the guy that gets all excited in the ad.
I used it on my brake light cutouts:
Click image for larger version

Name:	axistaillights3.jpg
Views:	84
Size:	82.3 KB
ID:	29209

If you buy a can I would recommend spraying a spare piece of wood or some other scrap just to see how it works and cures prior to going all out on the roof.
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Old 03-20-2021, 04:40 PM   #6
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Iíve never used the flex seal sealant, but their tape was useless. It wouldnít hold a seal on a water hose leak, and it had very little pressure!
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Old 03-20-2021, 04:56 PM   #7
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I would think that the paste should stick pretty well...
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Old 03-20-2021, 05:13 PM   #8
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Originally Posted by JamieGeek View Post
I used it on my brake light cutouts:
Attachment 29209

If you buy a can I would recommend spraying a spare piece of wood or some other scrap just to see how it works and cures prior to going all out on the roof.
Good idea. Will do.
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Old 03-20-2021, 05:25 PM   #9
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What started the lap sealant thread was, and this may be another thread; I was doing the AC coil cleaning which is a more involved job than applying lap sealant. First time I have done it since 2015 and it really needed it. After finishing up, replacing the AC cover, started looking around and noticed some, if not all the lap sealant was cracking.
Anytime I go on the roof there is something that needs attention.
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Old 03-20-2021, 05:31 PM   #10
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Quote:
Originally Posted by mcr1010 View Post
What started the lap sealant thread was, and this may be another thread; I was doing the AC coil cleaning which is a more involved job than applying lap sealant. First time I have done it since 2015 and it really needed it. After finishing up, replacing the AC cover, started looking around and noticed some, if not all the lap sealant was cracking.
Anytime I go on the roof there is something that needs attention.
That's why you only get a 90 warranty on roof leaks and are supposed to inspect the roof at least twice a year.
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Old 03-27-2021, 06:29 PM   #11
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Last summer, as an experiment, I tried using FlexSeal on my rubber roof where it goes over the side of the rig and attaches to the wall. I was having a few leaks and it seemed to stop them since then. So I bought 2 more cans and plan to do the back half of the roof the first few days that there is no rain. I prep the area by cleaning it with a Mr. Clean Magic Eraser. They also make a mop with a Magic Eraser on it so you don't have to get on the roof. The Magic Eraser cleans the area well. Just let it dry and apply the Flex Seal. The Flex Seal sticks to the clean rubber roof very well. My RV is 16 years old so I don't mind experimenting with stuff like this.
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Old 03-27-2021, 06:52 PM   #12
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Quote:
Originally Posted by mcr1010 View Post
Has anyone tried white Flex Seal instead of the standard lap sealant on any of your roof penetrations? I did a search and did not find any posts about it. It is a PIA to clean and re-do the lap sealant in those tight areas every 2-3 yrs. especially here in FL. I have Eternabond tape on most of the more or less straight seams and it is a do it once and it is done.
Eternabond tape is AWESOME!!!!! Never tried Flex Seal but it looks like a good product? Let us know. Bob Trice
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Old 03-27-2021, 08:59 PM   #13
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Good to hear that Flex Seal may hold up well on roofs.

As a test, I applied the Flex Seal spray on top of some lap seal around bathroom hatch. i.e. after I had cleaned it and the cracks in the lap sealant well . I masked off the roof at the edge of the lap sealant as it is kinda messy and sticky. It does not dry very fast either and has a tendency to run if you spray to much at once. I followed the directions and put on several coats, so will wait and see how well it holds up over time. If it holds up longer than the lap sealant it would be a good alternative where it is difficult or impossible to use Eternabond tape.
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Old 03-27-2021, 09:35 PM   #14
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I used the Flex Seal in a spray can on the shower skylight in my last class c. It did not hold up and did nothing to stop the leak I was experiencing. Scraping all the old dicor off and cleaning the area and then applying new dicor stopped the leak. The one thing I know is if it's sold on TV it is a gimmick. You never see anyone winning a fishing tournament with a pocket fisherman.
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Old 03-27-2021, 11:03 PM   #15
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Flex seal

Donít know about the roof, but I used flex seal on my awning canopy where it it was tearing and it also has pinholes.
Worked beautifully
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Old 03-28-2021, 01:16 AM   #16
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Is lap sealant the same as self leveling silicone? That self leveling silicone is fantastic. I had to move my antenna dome to do a modification and the roof vinyl was torn under it from the manufacturer. So I sealed it the resealed the screw holes on the dome. It was an ugly application but 5 mins later it was smooth and stayed like that. Nothing will get through that.
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