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Old 09-11-2017, 04:38   #31
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Re: Has anyone tried Flexseal below the waterline?

Greetings and welcome aboard the CF, Joel.
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Old 09-11-2017, 09:13   #32
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Re: Has anyone tried Flexseal below the waterline?

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Originally Posted by buzzstar View Post
A you absolutely sure slick or poison (a biocide) are the only two ways? If so, what is the basis for the statement?
Take a stroll down your local chandlery's anti fouling paint aisle. You tell me if there is anything that doesn't contain a biocide or works as a foul-release coating.

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And why are you so sure FlexSeal lacks either or both?
Because I've read the MDS for FlexSeal.
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Old 09-11-2017, 10:19   #33
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Re: Has anyone tried Flexseal below the waterline?

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Take a stroll down your local chandlery's anti fouling paint aisle. You tell me if there is anything that doesn't contain a biocide or works as a foul-release coating.



Because I've read the MDS for FlexSeal.
Just as a question. Is it possible that some flexibility may inhibit growth???
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Old 09-11-2017, 10:21   #34
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Re: Has anyone tried Flexseal below the waterline?

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Just as a question. Is it possible that some flexibility may inhibit growth???
As I've already mentioned; the flexible tubes or bottom of the inflatable dinghy in question already allow barnacle fouling without having FlexSeal on them. So the answer is no, flexibility in and of itself will not inhibit growth. painting the tubes with FlexSeal does not alter this.
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Old 09-11-2017, 10:33   #35
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Re: Has anyone tried Flexseal below the waterline?

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Originally Posted by fstbttms View Post
Take a stroll down your local chandlery's anti fouling paint aisle. You tell me if there is anything that doesn't contain a biocide or works as a foul-release coating.
While agree that it is unlikely that Flexseal will work as an anti-fouling coat, it wouldn't be the first time that someone discovered a secondary use for a product. I recall that disposable baby diapers were found to be fire resistant and now the materials are the basis for a fire retardant product.

The only real way to know if it works is to run a test. I would get a piece of GRP (aka fiberglass) and coat one third with Flexseal, one third with the anti-fouling paint of your choice, and leave one third uncoated. Then I would place it in the water for a minimum of six months to see how things work.
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Old 09-11-2017, 11:43   #36
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Re: Has anyone tried Flexseal below the waterline?

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Originally Posted by fstbttms View Post
As I've already mentioned; the flexible tubes or bottom of the inflatable dinghy in question already allow barnacle fouling without having FlexSeal on them. So the answer is no, flexibility in and of itself will not inhibit growth. painting the tubes with FlexSeal does not alter this.
I was asking more about surface flexibility not the flexibility of the hull? I'll admit it's a long shot, but who knows, the barnacles may not like a surface that oscillates even minutely and a flexible coating might provide that? If it worked a bunch of bottom paint companies would be pissed. Long shot but who knows? I've work in R&D where everything is a long shot.
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Old 09-11-2017, 12:54   #37
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Re: Has anyone tried Flexseal below the waterline?

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I was asking more about surface flexibility not the flexibility of the hull? I'll admit it's a long shot, but who knows, the barnacles may not like a surface that oscillates even minutely and a flexible coating might provide that? If it worked a bunch of bottom paint companies would be pissed. Long shot but who knows? I've work in R&D where everything is a long shot.
There are anti-fouling devices out now that use ultrasound vibrations to defeat slime and critters from adhering to the boat's underwater surfaces. The few test results I have read suggest they work but are not perfect. I don;t know if Flexseal will provide enough vibration to defeal fouling but in theory there is a chance, albeit not a great chance.
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Old 09-11-2017, 13:04   #38
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Re: Has anyone tried Flexseal below the waterline?

I can't add anything to the Flexseal as anti-fouling discussion but part of this thread included uses of Flexseal tape as an emergency fix. I have used the Flexseal spray to seal a persistent pinhole gap at the base of my keel, aft end right where it joins the hull. I'm sure this use will raise all sorts of indignation about doing a more traditional repair. However, for the sake of sharing information ... several years ago when I pulled my boat for the winter I noticed water leaking from the base at the rear of the keel. I had a fiberglass guy look at it. He said nothing to worry about structurally. My keel is encapsulated not bolted on. He ground down the area and applied new epoxy. Next year the water leaking out of the area returned. I concluded that "fixing" it while on the hard wasn't likely without significant new glass matting since any patch while the boat's weight was on the keel likely would fail as soon as it was lifted to be launched in the Spring. So 4 years ago I scraped the area down to the gelcoat, masked it off and applied 3 coats of Flexseal. Then I painted the bottom as normal. That fall - no leak. The following year it failed but when I redid it, it held the next summer. Obviously it flexes enough at launch time and is substantive enough over a summer of sailing to be an effective fix for a small break in my hull's gelcoat. A little time and not much money is good enough for me.
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