Bumble
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| posted on 20/7/10 at 02:30 PM |
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Sikaflex
How do you all stop the Sikaflex or similar from drying up after opening and blocking the nozzle?? Bl**dy annoys me every time. I've tried
various methods none of which are ever very successful. Is there some trick I'm missing??
Cheers,
Matt
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BenB
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| posted on 20/7/10 at 02:33 PM |
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Just an idea but it's solvent based so wouldn't keeping it in the fridge / freezer work.
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balidey
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| posted on 20/7/10 at 02:34 PM |
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Get extra nozzles. Make sure you leave the nozzle full so its that bit that dries up, not the tube. Then just use a new nozzle. They are meant to be
dispossable. As far as I know there is no good way of saving a nozzle. And we use a couple of hundred tubes a week at work.
Dutch bears have terrible skin due to their clogged paws
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sucksqueezebangblow
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| posted on 20/7/10 at 03:58 PM |
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As far as I am aware, once it is opened it is going to go hard whatever you do. It lasts a couple of days before going off in the tube. I try to plan
ahead and have enough jobs ready to use most of a tube at once. Or just resign myself to the fact that the leftovers will be chucked away.
Better to Burnout than to Fade Away JET METAL ~ AndySparrow © 
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RazMan
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| posted on 20/7/10 at 04:16 PM |
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I put a Biro cap over the end which delays the inevitable hardening for maybe a couple of weeks but basically, use it or lose it  There must be a
market for smaller tubes of PU adhesive and I would love to buy a couple for those smaller jobs. I discovered that some of the black gasket compounds
are almost identical and I have used them with good results.
Also remember it has a limited shelf life so even if you have a few unopened tubes hanging around in the workshop, they will go off after a year or
so.
[Edited on 20-7-10 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Canada EH!
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| posted on 20/7/10 at 04:31 PM |
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I usually stick an old nail the size of the nozzle inside the nozzle then pull it out with pliers when i need to use it again. Works for me.
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stevegough
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| posted on 20/7/10 at 04:48 PM |
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quote:
Originally posted by Canada EH!
I usually stick an old nail the size of the nozzle inside the nozzle then pull it out with pliers when i need to use it again. Works for me.
wot he said, but I use a woodscrew, - screw it in, clamp in the vice, and pull it out whilst increasing the pressure using the pump action of the gun.
Or, indeed, get another nozzle.
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
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Sold to Mike in Methyr Tydvil 19/03/14
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Wadders
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| posted on 20/7/10 at 05:23 PM |
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It's moisture in the air that cures it once opened. Putting it in an airtight freezer bag helps, but iv'e never found a definitive way to
stop it going off.
Al.
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dave r
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| posted on 20/7/10 at 05:34 PM |
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fridge does work, but i find that the piston at the other end of the tube tends not to be a good enough seal, and you break the mastic gun, breaking
the cured sikaflex at the end
we use a sika product at work that is in sausage tubes, that go in a different gun.... anyone know if you can buy pu adhesive in this style package ?
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dazzx10r
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| posted on 20/7/10 at 05:48 PM |
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I use a self tapping screw in the end of the nozzle, seems to last ok for me, when re-using it i have found its best to warm the tube
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russbost
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| posted on 20/7/10 at 05:53 PM |
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I use a similar product, which uses a different gun & comes in sausage tubes (like a plastic bag), I'm not sure if it's actually a PU
sealant & wouldn't use it for anything that was "stiction critical" but it is way better than silicon for adhesion & miles
cheaper than sika + it doesn't go off, just leaves a little solid bung at the end of the nozzle that you can easily remove. By the time
you've used a couple of tubes you've more than paid for the gun & are saving money - to say nothing of saving your temper when the
bl**dy Sika has gone solid in the tube again!!!
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twybrow
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| posted on 20/7/10 at 06:29 PM |
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I go for a woodscrew, then a wrap of clingfilm, and make sure you store it somewhere cool and dry. It is warmth and moisture that sends it off. My
last tube was still usable 6 months after I opened it...
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