Forums > Kitesurfing General

Kite Bladder Valve Replacement and Glue

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Created by jetstream > 9 months ago, 18 Nov 2013
windreams
QLD, 258 posts
19 Mar 2014 12:24AM
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Sorry if you’ve seen this before as it was posted a few months ago. Rather than heating up those welded valves and trying to pull them away from the bladder I followed this You Tube guy’s advice. Used a stick-on valve and it was easy, even for a first timer...

knotwindy
42 posts
19 Mar 2014 1:24AM
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airtime also makes a valve trap which allows you to reuse the old valve as if it were a new stick on for only 6 or 8 dollars. much cheaper and almost as fast. you just put the old valve inside the two layers of the trap, it glues on both sides and then peel the back off just like the new stick ons. they claim it works better because they can use 2 types of glue, 1 that is best for the valve material and 1 that is best for the bladder material. don't know about that but i have used them and they are working great so far.

Fly on da wall
VIC, 663 posts
19 Mar 2014 8:53AM
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A friend tried valve traps and u stick valves and they all failed within 2 months.
Stormsure glue and aquaseal work well.

Robbo2099
WA, 709 posts
19 Mar 2014 10:03AM
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If you're going to glue them back on yourself, Aquaseal is by far the best glue amongst all the options. Found that Stormseal works sometimes, sometimes not so well. Seems to be dependent on the type of bladder you're glueing. On some bladders it just doesn't seem to adhere well and you can peel it off after it's dried, whereas the Aquaseal is always fully permanent and doesn't peel off. As previously pointed out, once you open the tube it goes off within a month or so. I found that if you take a nail about 3-4 cm long and put it in the nozzle before you put the cap back on (then put it in the freezer) will allow you to continue to get the glue out, even after it has set on the edges.

ActionSportsWA
WA, 637 posts
19 Mar 2014 3:06PM
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Hi Peeps,

Please don't do your own repairs with glue. We get kites in the store EVERYDAY needing replacement valves. It is quick, effective and cheap for us to do long term repairs to your kite rather than try and stuff around fixing the mess some customers make of their kites and then doing a repair.

We had a customer bring a 2nd hand kite in that had the valves all replaced by "someone" prior to sale. They had done a really poor job and many leaked requiring the replacement of at least 4 additional valves.

Please question how much you are going to save by doing it yourselves. I know a few have had success with glue, but in our experience, there are many, many more failures than there are successes and the repairs to the "repairs" are much more costly and time consuming as we have to remove all the glue residue or cut out the effected area altogether to facilitate a good clean reliable repair.

We use U-Stick, G-Stick and Kitefix. All are good but G-Stick are cheaper. There was a batch problem a while ago with G-Stick, but no issue since then and none of our repairs have failed.

If you are anywhere near a good shop, just drop it in and have the kite sorted professionally. We guarantee our bladder work unconditionally. We have so much experience in repairing bladders, from falling off valves, to pinholes invisible to the naked eye, to catastrophic leading edge failure bladder damage.

DM


Kazan
QLD, 699 posts
20 Mar 2014 5:06PM
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Select to expand quote
ActionSportsWA said..

Hi Peeps,

We use U-Stick, G-Stick and Kitefix. All are good but G-Stick are cheaper. There was a batch problem a while ago with G-Stick, but no issue since then and none of our repairs have failed.






I've had terrible success with this, which you claim above works...

www.ebay.com.au/itm/like/290941798278?limghlpsr=true&hlpv=2&ops=true&viphx=1&hlpht=true&lpid=107

That glue is useless. It doesn't stick to valve rubber (as opposed to the bladder itself) and takes a very long time to dry as well. That's why I recommended Stikaflex earlier. It works but I admit it also takes a long time to dry. However it sticks to anything - including rubber valves as they are made from the same ingredient the glue is made from. No brainer there.

suniboy21
VIC, 1090 posts
20 Mar 2014 6:10PM
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I seriously don't understand why you wouldn't just replace the bladder, the amount of time spent re-gluing and hoping it will work.
A pin hole I can kind of understand or one leaking valve but replacing all valves, far out.... what a waste of time!

Loftywinds
QLD, 2060 posts
20 Sep 2014 9:45PM
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Well the hammer has fallen on me and now I have to replace over 20 valves! Ouch!!
But I'd rather reglue them. I am about to get two tubes of either Stornsure or Aqualseal.
It's an old kite around 2011 and I reckon I could reglue them all back if only I use the right glue.
So which one do you recommend?
thanks

Loftywinds
QLD, 2060 posts
22 Sep 2014 1:24PM
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Select to expand quote
suniboy21 said..
I seriously don't understand why you wouldn't just replace the bladder, the amount of time spent re-gluing and hoping it will work.
A pin hole I can kind of understand or one leaking valve but replacing all valves, far out.... what a waste of time!


Not all kites have spare bladders available, especially older kites. Besides, a full bladder kit can cost over $300 not incl freight!

sarc
NSW, 71 posts
22 Sep 2014 2:23PM
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Just sharing my experience which is quite a bit since I use North kites which (as mentioned in earlier post) USED TO HAVE 100% valve failure (I have Rebel 2012 models now and they are holding up fine so far).
- Aquaseal, several repairs, lasted a good 3 years on heavily used kite
- 3M 5200 quick dry, several repairs, lasted 2 years

I think the key to repair lasting long is that the glue must match the stretch of the bladder and valve when inflated/deflated, plus high temperature and humidity, over long time. Both above are very reliable choices.

Stick-on valves: I got a no-brand name from my local dealer, came off right away and left an awful mess of glue that could not be re-glued on. So be careful and use brand name stick-on would be my suggestion.

Good winds to everyone!

Ragzilla
VIC, 237 posts
24 Sep 2014 2:50AM
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i usually just yell really loud and make threatening gestures, then throw a few good solid kicks into the LE. works a treat most of the time !!if problem still persist, resort to going home and kicking the dog instead!VOILA ! *****

Ragzilla
VIC, 237 posts
24 Sep 2014 2:58AM
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i got a kite repaired by MOTI LEVY earlier this year. he does bladder repairs. his claim is any tear or blow out can be repaired. anybody know how they do this?would it be a patch ?or would they cut out the damaged section and mould / melt a new section in its place?i have a mint condition kite ( except for the torn bladder of course ) , would like to get it repaired for the misses, but this bladder looks like its been minced in a blender. i can't imagine a patch can fix it. perhaps it would hold for 1 season, but i can't imagine it would be a permanent fix.curious to know exactly how it can be a guarantee fix ?yes, i have enquired about a new bladder, but its a 2008 AIRUSH FLOW. good luck finding one of those. its just a damb shame to see an immaculate kite sitting round with no bladder.

Loftywinds
QLD, 2060 posts
25 Sep 2014 8:21AM
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Select to expand quote
Ragzilla said..
i got a kite repaired by MOTI LEVY earlier this year. he does bladder repairs. his claim is any tear or blow out can be repaired. anybody know how they do this?would it be a patch ?or would they cut out the damaged section and mould / melt a new section in its place?i have a mint condition kite ( except for the torn bladder of course ) , would like to get it repaired for the misses, but this bladder looks like its been minced in a blender. i can't imagine a patch can fix it. perhaps it would hold for 1 season, but i can't imagine it would be a permanent fix.curious to know exactly how it can be a guarantee fix ?yes, i have enquired about a new bladder, but its a 2008 AIRUSH FLOW. good luck finding one of those. its just a damb shame to see an immaculate kite sitting round with no bladder.


You have two choices IMO. Send it to Moti or replace the bladder from another brand. Check on ebay, as there is a guy there sells bladders and LE kits all the time, but expect to pay around $200 for an entire kit.
You could try and repair it, but you'll need another old bladder to destroy by cutting a big enough patch and gluing it on. Aquaseal is the glue you need.

Loftywinds
QLD, 2060 posts
25 Sep 2014 8:24AM
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I don't understand why bladders for kites are not made from the same stuff used for bicycle tubes. Much more durable, and easier to repair with readily available bike repair kits. But nah we had to go with polyutherane, which is as weak as chicken skin!

Jamessyduniv
WA, 17 posts
25 Sep 2014 12:01PM
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best glue for bladder and valve repair :Sikaflex 291 or 292. They are both polyurethane glue, bladder are in urethane. I repaired a lot of valve and never had to do it twice

Loftywinds
QLD, 2060 posts
25 Sep 2014 3:24PM
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Select to expand quote
Jamessyduniv said..
best glue for bladder and valve repair :Sikaflex 291 or 292. They are both polyurethane glue, bladder are in urethane. I repaired a lot of valve and never had to do it twice



If it's anything like the Sikaflex I used, based on earlier advice up this thread, it's rubbish. The stuff does not dry completely and it holds air but heat eventually peels it all off again. Aqualseal is the only glue I found to work with valves especially.

Jamessyduniv
WA, 17 posts
25 Sep 2014 2:20PM
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it's not the sikaflex you will find in bunnings (11FC) the 291 and 292 are marine grade skiaflex (I'm not working for sikaflex hahaha)

Fly on da wall
VIC, 663 posts
25 Sep 2014 6:27PM
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Well stormsure hadn't let me down... N I dont sell anything.... Even my old kites n boards...

JTaipei
SA, 5 posts
26 Sep 2014 12:57AM
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I used 3M 5200 Fast Cure and also Aquaseal with good success rates but still have some valve failures occassionally. A friend from the boat industry gave me some glue which contains Polyurethane and M. E. K. (Methyl Ethyl Ketone, an industrial solvent). This glue works even better than 3M 5200 and Aquaseal. However, it is highly flammable and the vapor is slightly irratating to the eyes and the nose.

Jamessyduniv
WA, 17 posts
26 Sep 2014 5:26AM
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Yep MEK+polyurethane glue are the one used to build inflatable boat tub

coastflyer
SA, 546 posts
3 Oct 2014 5:03PM
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I have a 2010 North Rebel that started leaking the other day, so removed the bladder and found valves peeling off. I carefully peeled them off and thought about how they are made, and came to the conclusion that their engineering is not quite right! When inflated, there is tremendous force on a valve, so I thought, why not mount valve from the INSIDE. I just stretched the hole slightly and placed the valve inside withe the flange area pushing up on the inside of the bladder, and using suitable glue, found that I had a really strong, air tight join. Hasn't leaked yet in my mind seemed such a simple solution!







Loftywinds
QLD, 2060 posts
3 Oct 2014 10:30PM
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Select to expand quote
coastflyer said..
I have a 2010 North Rebel that started leaking the other day, so removed the bladder and found valves peeling off. I carefully peeled them off and thought about how they are made, and came to the conclusion that their engineering is not quite right! When inflated, there is tremendous force on a valve, so I thought, why not mount valve from the INSIDE. I just stretched the hole slightly and placed the valve inside withe the flange area pushing up on the inside of the bladder, and using suitable glue, found that I had a really strong, air tight join. Hasn't leaked yet in my mind seemed such a simple solution!











Nice tip! Thanks!

I am sticking with Aquaseal though. But your glue is good to know.

Did you invert the bladder and then glue the valve? Video pls?

coastflyer
SA, 546 posts
4 Oct 2014 8:43AM
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Loftywinds, in the pics, this was a trial run on a old valve and bladder. You do not need to invert the bladder which would be impossible without cutting it. I just put a generous amount of glue on the TOP of the valve flange , and while stretching the bladder hole with your fingers, place the valve in there and then pull the valve UP. Place on a hard surface and clamp as per the video above. The glue that I use is similar to the wetsuit repair glues and is very compatible with valve and bladder material. The Bostik glue also sets very quickly, but remains flexible. Although I haven't tried this, I would think that it would be possible to pressurize the bladder while the glue is curing and this would force the valve flange up against the inside of the bladder to make a perfect join. Sorry, I don't have a video as the bladder is back in the kite and is sitting in my garage fully pumped up and it has not lost any pressure, after two days, so I'm happy! This method of repair may also work with stick on valves, where the bladder has been damaged by a unsuccessful glue fix to the outside of the bladder. The inside of the bladder should still be clean, and glue would need to be applied to the top of the valve flange, and the peel off covering left ON, so that it doesn't stick to the opposite side of the bladder.

SaveTheWhales
WA, 1602 posts
6 Oct 2014 9:44AM
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I had to laugh the other day as one of my older kites had a slow leak - pulled the one side of the bladder out and found the offending strut valve peeling off - pulled the the other side out but no sign of the valve ? It just fell off inside the leading edge :)
Glad to have found they need re glueing now rather than the beach or holiday... Storm sure glue works well



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"Kite Bladder Valve Replacement and Glue" started by jetstream