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Raft Sealant Kit

Item: 38707.01 | Product Description »

$64.95

  (5) | Write a Review | Ask a Question | 11 Questions

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Pinhole leaks? Porosity problems? Liquid urethane seals the boat from the inside. One quart will repair the main tubes of a small 12-foot Pennel Orca®, Hypalon®, neoprene, or PVC raft.

All sales of flammable items are final.

Product Reviews

  (5)
Material: Liquid urethane

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11 Questions | 36 Answers
Displaying questions 1-10Previous | Next »
  • Raft Sealant Kit

    Q:

    Will this work on an inflatable SUP (brand is Boardworks SHUBU) -- leaking at seams. How much would I need for 2 boards?
    Asked on 8/3/2014 by Cindi from Nicaragua

    1 answer

    • Staff Reviewer

      A:

      Cindi, these inflatable boards use a drop-stitch construction, where thousands of fibers join the two side together. Putting this material in there would be a disaster. Talk to Boardworks and see what they recommend to fix your leaks.

      Answered on 8/3/2014 by Clyde from NRS
  • Raft Sealant Kit

    Q:

    Have an old Dunlop 9 footer with Halkey Roberts valves - is it possible to leave these valves in place and add in the sealant?

    Also, if I were to replace the valves, are the holes in the hypalon standard diameters, so that most any type valve would work?

    Thanks, Dave
    Asked on 6/13/2014 by asimplelife from Everett, WA

    3 answers

    • VERIFIED BUYER

      A:

      If you bypass the valve with a small tube and funnel the sealant is very thin. I don't think all valves are the same.
      Don't forget to keep the raft inflated for several days, exchanging the air frequently

      Answered on 6/15/2014 by Anonymous
    • VERIFIED BUYER

      A:

      I left my valves in an poured the sealant in carefully through them. I kept working them open and closed. They did begin to stick but I was able to free them without too much effort. On the whole though I didn't have a lot of success with the sealant. My boat still leaks air through the fabric.

      Answered on 6/13/2014 by Anonymous
    • Staff Reviewer

      A:

      Dave, the only I know to use the sealant with a valve that has an inner piece is kind of a "ship-in-a-bottle" type of operation. You take a piece of plastic wrap, work it around the inner piece and tie it shut with string. Then you tie that string to something bigger than the hole. The tricky part is rejoining the inner and outer valve parts, because you need to do that so you can softly inflate the chamber. You have to have it inflated while the sealant sets or you glue the sides together. So, you pull the edges of the plastic up through the hole, get the threads of the valve pieces started and pull out the plastic. Or, you can just push the plastic back into the tube. It'll stick to the sealant and shouldn't create a problem. Be sure to do a "dry" run to see if you can make it work. If you ever have to replace a valve, the slickest way to do it is shown in this video - http://www.nrs.com/learn/how-to-replace-a-raft-valve.asp

      Answered on 6/13/2014 by Clyde from NRS
  • Raft Sealant Kit

    Q:

    This product looks like it is what the doctor ordered!! One Quick question tho: I have an older Riken with one chamber that has definite porosity problems. When inflated and hit with soapy water there is a spot approx. 4"-5" in diameter that looks like it holds air like a wet T-shirt (bubbles all over!); will this work as is or would a patch over, then Flexseal be best? Also while I'm doing one.. Might as well do the rest. How many kits would you recommend for a 13'-13'6" boat with 20" tubes given the porosity issue above? (Ok, so it was two questions)
    Thanks,
    Asked on 6/8/2014 by Gearman from Red Lodge, MT.

    3 answers

    • VERIFIED BUYER

      A:

      Do both. The sealant works really well, but the patch would ensure closure. I think that one can would be enough. Our boat is 10' with two large inflatable tubes on each side. As long as you do this when it is warm out so the sealant pours easily, you should have no trouble.

      Answered on 6/10/2014 by Anonymous
    • VERIFIED BUYER

      A:

      Patch it and use two flex seal kits one for each tube

      Answered on 6/8/2014 by Anonymous
    • Staff Reviewer

      A:

      A area of 4"-5" in diameter will be better fixed with a patch. Flexseal is the best solution for general porosity problems. If you're not finding porosity in the other chambers, consider yourself lucky. If you did have to treat the whole boat it would probably take two kits.

      Answered on 6/8/2014 by Clyde from NRS
  • Raft Sealant Kit

    Q:

    on an old avon with military valves, it seems some folks remove the valves, some don't. is it possible to not remove the valves?
    Asked on 10/31/2013 by flowfree from central coast,ca.

    3 answers

    • VERIFIED BUYER

      A:

      Yup, you can pour the stuff right through a military valve. I had an older
      spare military valve laying around that I used to pour the flexseal through
      so I wouldn't have to deal with the philips screws while the stuff was
      starting to cure. But after using that same valve for a couple of chambers
      it got quite gummed up and it was tough to peel off the cured flexseal, but
      it could be done. So, you can pour the flex-seal through the valve without
      removing it, but you may want to take it off afterward to peel off the
      cured flex-seal in the valve.
      Happy boating, and good luck breathing new life into an old piece of
      rubber...

      Answered on 11/1/2013 by Anonymous
    • VERIFIED BUYER

      A:

      I tried flexseal without removing the valves. I have Leafield B-7 plastic valves. I tried using a skinny funnel to get past the valve. The flexseal still gummed up the valve, and I had to replace one of the two valves on the raft. I also made the mistake of deflating the raft just a little bit after adding the flexseal. The deflation blew some flexseal out of the valves. Avoid deflating the raft after it is inflated. I don't thing the flexseal will stick to the metal on the military valve, but it will bond to the rubber gaskets and such inside the valve.
      On a second attempt with another raft, I used a peristaltic pump and 1/4" tubing that I was able to slide past the valves. This method worked well. And I did not let air out of the raft for a few hours. On this attempt I used Toobseal.
      http://www.bixlersmarine.com/Products/ToobSeal
      Flexseal does not repair seam damage. And really only works with "pin-hole" leaks. Anything larger, put on a patch first before flexseal. I also think sunlight hitting the raft caused flexseal to break down.
      The next year, I finally had the cash to just buy a new raft. I now just use my older raft with friends and a hand pump on day trips. My old raft is a piece, it is held together just with glue and new seam leaks are always happening.
      Hope this helps.
      Mark O'Malley

      Answered on 10/31/2013 by Marko from Westfield, MA
    • Staff Reviewer

      A:

      Since your boat has military valves you've got the perfect situation; all the valve parts are on the outside of the boat. With other types of valves that have an inner portion you have to protect from getting gunked up with the sealant. By all means remove the valves. Pour in the sealant and rotate the boat to spread it in the areas that are leaking. Be sure to get a couple of friends to help with the manual labor. If you need new valve screws, we have them, Item # 38517.01.

      Answered on 10/31/2013 by Clyde from NRS
  • Raft Sealant Kit

    Q:

    I have a 16 1/2 foot cataraft; double tubed on each side. So I have a total of four tubes. This is similar to the old AIRE double tubed cataraft. How many quarts will I need?
    Asked on 9/1/2013 by Ranger from Montrose, CO

    4 answers

    • VERIFIED BUYER

      A:

      I would go with two cans

      Answered on 9/17/2013 by Anonymous
    • VERIFIED BUYER

      A:

      I used one kit for my 13.5' raft. I did my middle thwarts with it as well. I concentrated on areas that were suffering from pin hole leaks. If you want to cover everything really well, get two kits. Hope this helps
      Matt
      Sent from my iPhone

      Answered on 9/5/2013 by Anonymous
    • Staff Reviewer

      A:

      That's a tough call, Ranger. Each double-tube of the set is probably going to have more surface area than a 12' raft. I suspect you'll need three sealant kits to give good coverage of all the areas of the tubes. Usage tips: recruit some help to do the job, patch any large (more than pinholes) holes or tears first and if your valves have an inner part put it in a plastic bag that's secured to something on the outside of the tube so you don't lose it. Good luck and give us a call if you have questions, 800.635.5202.

      Answered on 9/1/2013 by Clyde from NRS
    • VERIFIED BUYER

      A:

      At least 2, but I am sure the company can tell you.

      Answered on 9/1/2013 by Anonymous
  • Raft Sealant Kit

    Q:

    hey there is no directions on this site on how to apply it.. I know you pour it in the and try and get the entire inside sealed evenly.but my boat is a jet so i don't think im gonna be able to roll it over to get the tops sealed without a major fight.i live on a bumpy road and can go for a hell ride and slosh it all over,slam the brakes and punch it i guess?i hopes i don't need to drain it afterwards.that would be a trick.any helpful hints?thanks ladies and gents.hoplessly sinking lol
    Asked on 7/7/2013 by Ronald from United States

    3 answers

    • VERIFIED BUYER

      A:

      Really only way is to roll over to ensure coverage I hung mine between
      trees and gently rolled it real tough to get nose properly.

      Answered on 7/23/2013 by Anonymous
    • VERIFIED BUYER

      A:

      You should try and unbolt the motor so you can get boat on each side briefly so it can seal things up. Do this a couple of different times and be sure it's not filled to the max, needs to only be 80% inflated. Going down the road bumpy or not just will not do it.
      Christopher
      Sent from my iPhone

      Answered on 7/7/2013 by Anonymous
    • Staff Reviewer

      A:

      Ronald, the use instructions are in the More Information box on the product page. You will need to get the material onto the areas that are leaking. If you can't it won't work. It's a syrupy consistency, not liquid enough to do what you describe. Doesn't sound like it will work for you unless you can rotate the boat to get the sealant where it needs to go.

      Answered on 7/7/2013 by Clyde from NRS
  • Raft Sealant Kit

    Q:

    what is the best way to clean sealant off of my c7 leafield valve? do you have to remove the valve entirely to apply sealant? if not what is the best way to ensure that the interior valve screen does not get sealant on it? if so what is the best way to keep the boat inflated if the valve is completely removed? I am assuming that it would not be a good idea to completely remove the interior valve screen just to use the sealent
    Asked on 6/28/2013 by spraguer

    2 answers

    • VERIFIED BUYER

      A:

      Hi
      I used sealant on our very old raft about 5-6 years ago. It fixed the leak, wherever it was, and it hasn't returned. Just follow the directions and be sure to have the raft slightly inflated. I didn't remove any valves, just poured it in each of them. Our raft has 3 compartments.

      Answered on 6/28/2013 by Anonymous
    • Staff Reviewer

      A:

      Using this with an older boat, with military valves, is a snap, because all the valve guts are on the outside of the tube. With valves like the C7 Leafield, it's trickier. You'll have to remove the outer portion of the valve, then use a small plastic bag, or sheet of plastic wrap, to enclose the inner valve portion. Tie a strong cord to the bag and tie the other end to something larger than the valve hole, so you don't lose the inner piece inside. Add the mixed Raft Sealant and do the whole moving around and massaging of the sealant where it's needed; be sure to have a buddy or two to help with this step. Now comes the real tricky part. You have to open the bag, or spread out the plastic wrap, so that the inner valve piece is lined up with the hole in the tube so you can screw in the outer piece... without getting sealant into the working parts of the valve. The bag/wrap stays in the tube. Getting some sealant on the inner piece of the C7 isn't fatal, since all the working part are in the outer piece, but you have to keep it off the inner rubber valve seal. Now you can inflate the chamber. If you do end up accidentally gunking up the valve, you're going to have to remove it. See this video for that process - http://community.nrsweb.com/duct-tape/2012/09/28/how-to-replace-a-raft-valve/ - Take your time and Good Luck!

      Answered on 6/28/2013 by Clyde from NRS
  • Raft Sealant Kit

    Q:

    What constitutes a pinhole leak? I ask because I'm working on a raft that had major issues on a seam. I've mostly resolved them, but there's one spot where I guess I didn't quite get the patch completely flat (really tough spot to work on and not on the seam itself) and when I soap it there's a bubble about a third the size of my pinky nail; small but noticeable. In my mind that would be considered a pinhole leak, but I'd like other opinions.
    Asked on 2/11/2013 by Deuce from Arkansas

    3 answers

    • Staff Reviewer

      A:

      It sounds like that leak would qualify as a "pinhole" and the Flexseal should seal it.

      Answered on 2/11/2013 by Clyde from NRS
    • VERIFIED BUYER

      A:

      That would qualify in my mind if it popped and further bubbles continued to
      develop or other bubbles developed alongside it.

      Answered on 2/11/2013 by Treefrog from Seattle
    • VERIFIED BUYER

      A:

      Yes that would be a pinhole leak. Also can be thought of as a real slow leak.. My raft suffered from many pinhole leaks and needed to be inflated every few hours. After using flex seal it now still has a leak it two, but holds air for days and just needs a bit if a top off of air which I quite normal. Hope this helps
      Matt
      Sent from my iPhone

      Answered on 2/12/2013 by Anonymous
  • Raft Sealant Kit

    Q:

    But won't work on high pressure floor?
    Asked on 10/13/2012 by Ereiss from Boston

    3 answers

    • VERIFIED BUYER

      A:

      I didn¹t use it on my floor as it has a bladder and pressure release valves..
      So you are right, no, I don¹t think it will work on the floor either if it
      is set up this way.

      Answered on 10/15/2012 by Anonymous
    • Staff Reviewer

      A:

      Yes, it would seal pinholes in a floor, but because of the I-beams in most inflatable floors it would be difficult, if not impossible, to get it distributed properly.

      Answered on 10/15/2012 by Clyde from NRS
    • VERIFIED BUYER

      A:

      I acually never tried it on the high pressure floor. Likely more
      complicated bc of drop-stitching or I-beams

      Answered on 10/15/2012 by Gorge-y from PA & WV
  • Raft Sealant Kit

    Q:

    have a old avon hypalon inflatable 9-10 foot think it is pourus and need the adhesive to the inside will RAFT SEALANT KIT WORK FOR ME
    Asked on 9/22/2012 by OLE CAPTAIN BILL from SUN CITY FLORIDA

    8 answers

    • VERIFIED BUYER

      A:

      Did the trick for an Apex inflatable for me . . .

      Answered on 9/22/2012 by Anonymous
    • VERIFIED BUYER

      A:

      The raft sealant kit should work just fine unless your fabic is rotten.

      Answered on 9/22/2012 by Anonymous
    • VERIFIED BUYER

      A:

      I used it on my old osprey and it worked great. Be sure you mix it well and use it in a well ventilated area! It puts off some
      Pretty strong fumes

      Answered on 9/22/2012 by Anonymous
    • VERIFIED BUYER

      A:

      It worked great for my old Avon. Make sure you have any holes patched on the exterior first. Then make sure to move the boat up down and all around to insure a good coating. Made my tubes like new again. Boat would hold air for weeks

      Answered on 9/22/2012 by bicyclejuju from Florida
    • VERIFIED BUYER

      A:

      Yes it will work fine.  You need to follow the directions carefully and make sure you get good distribution of  the sealant throughout the tubes.
      Mike Bordelon

      Answered on 9/23/2012 by Anonymous
    • VERIFIED BUYER

      A:

      Yep. If you can get your valves off and pour in the sealant, you should be satisfied with this product. I t has worked for me.

      Answered on 9/23/2012 by Anonymous
    • VERIFIED BUYER

      A:

      I used this sealent three years ago on a maravia 13' SB.  In the end it helped.  It wont make your boat new again, but it will give some extra life. You need to go in with a plan.  Do 1 tube section at a time and taget the problem areas.  Also, you will need to do something with the valves..  Remove them and find something other than the valves to block the place where the valves were.  The latex will gum up valves. The sealent leaves a latex film inside the boat and pieces of latex pill off the inside tube.. This too can cause future valve issues. But you just need to make sure that the valve is free of latex pieces.  I can send some pics of what will happen inside the tube if you want me too.  Just go in with a plan and "take your time."  It mostlikely wont help with a SB floor.  Tubes only! Chris  ****@***.***

      Answered on 9/24/2012 by Idaho Floater from In a van Down by the river
    • VERIFIED BUYER

      A:

      It fixed ours perfectly.

      Answered on 9/27/2012 by Anonymous
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Raft Sealant Kit
 
4.2

(based on 5 reviews)

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    (1)

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    (4)

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100%

of respondents would recommend this to a friend.

Pros

    Cons

      Best Uses

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          • No (5)

        Reviewed by 5 customers

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        4.0

        Worked for our old Dunlop

        By asimplelife

        from Lake Stevens, WA

        Verified Buyer

        Pros

        • Directions Are Clear
        • Restores Old Inflatables

        Cons

        • Very Strong Vapors

        Best Uses

        • Inflatables With Pin Hole

        Comments about Raft Sealant Kit:

        First we used the baggie/string method to hold the female valve fitting inside the tube. That was so much hassle, we opted to go with a strong spring clamp that held the flange via folding some of the hypalon over it. Then we poured the mixture in the fabric hole (downhill) away from the clamped inner valve piece. This method was much easier for us. Have had the dinghy out working crabpots. :)

        • Was this a gift?:
        • No
         
        4.0

        so far, so good.

        By N/A

        from Missoula, MT

        About Me Casual/ Recreational

        Verified Buyer

        Pros

          Cons

          • Difficult to Use

          Best Uses

            Comments about Raft Sealant Kit:

            Flexseal greatly reduced the porosity on my ancient NRS Sprite with one application. With 2 applications it seems to have cured it altogether. I haven't yet used the boat on the river, so I don't know how it will hold up to multiple deflations/inflations but, so far, it seems to work exactly as represented. Pretty pricey and super toxic to work with (organic vapor respirator is a must) but all in all it appears to be a good product.

            • Was this a gift?:
            • No
             
            4.0

            worked great

            By bicyclejuju

            from Florida

            Verified Buyer

            Pros

              Cons

                Best Uses

                  Comments about Raft Sealant Kit:

                  I added it to my rib boat. The boat has no lleaks so it must have worked. The description says for its enough for main tubes of a 12' boat. I think I should have used about 1 and a half x the amount they say it covers. So if in doubt buy more for better coverage.

                  • Was this a gift?:
                  • No

                  (1 of 1 customers found this review helpful)

                   
                  5.0

                  Great Stuff

                  By Ben the raft mechanic

                  from Salem, OR

                  Verified Reviewer

                  Pros

                  • Easy to Use
                  • Great seal
                  • Raft is usable in 24 hrs

                  Cons

                  • Requires two people
                  • Smells terrible

                  Best Uses

                  • Fixing a raft

                  Comments about Raft Sealant Kit:

                  I used this to seal my 11ft hypalon raft that had a few hundred pin holes and would not stay stiff for more than about 10 minutes. Worked amazingly well and was easier than expected to apply. My raft doesn't leak at all anymore! I saved a little bit to do the thwarts too. Make sure you use an organic vapor respirator, this stuff is really strong smelling, but that means it works well.

                  • Was this a gift?:
                  • No

                  (2 of 2 customers found this review helpful)

                   
                  4.0

                  Raft Sealant kit

                  By Admiral CK

                  from Elizabeth City, NC

                  Verified Buyer

                  Pros

                  • Application is easy
                  • Mix is easy
                  • Seals pin holes overnight

                  Cons

                  • 2 guys needed flip raft

                  Best Uses

                    Comments about Raft Sealant Kit:

                    Used to seal up pine holes in my West Marine 10.2 RIB, made of PVC.

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                    • No

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