Cyanoacrylate/epoxy fast-setting superglues for exterior jobs

Dear all,
do you have experience with so-called fast-setting superglues (such as
cyanocrylate-based or epoxy-based ones) in permanent exterior jobs?
Basically, I am resizing plastic air vent bricks (e.g., see
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.This involves cutting it down to exact size and regluing atleast one
of the sides. I would also like to glue a thin-mesh plastic net (the
kind used in greenhouses to cut down on the amount of solar radiation
passing through) over the grid to keep out fine-grained garden dirt.
So most of the glued parts would be exposed to all sort of weather
conditions.
My concern is that although the above glues are fine for interior
jobs, (and cheap to purchase in places such as Poundland) they may not
be UV- or water resistant in the long term.
Any suggestions? Thank you in advance.
Reply to
Woland
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.> This involves cutting it down to exact size and regluing atleast one
Plummers plastic weld or...
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Reply to
George
In message , The Natural Philosopher writes
Screwfix also have a smaller size available if you just want it for one job.
Reply to
Si
Thanks to everybody for the suggestion. I used Marley solvent cement (a remainder from a previous diy drainage job) and it has provided the best result (over a number of other supposedly fit-for-purpose superglues). Glue dries transparent, no mess, good mechanical strength good, fast and controllable setup with a more complicate situation than just fitting one PVC pipe into another.
This triggers a second question: the glue I used - bought in Autumn 2005 - has 04/2006 as its expiry date, with an explicit recommendation from the manufacturer not to use it beyond that date. Nevertheless, I used it in my experiment all the same because I was impatient to test it and see the result.
I would not generally risk an unsound result just to save a fraction of the approx. =A32 spent on the small-size tube more than two years ago. However, I am wondering whether in your experience this expiry date issue is driven more by market greed rather than by an acknowledge technical problem with chemical instability of the glue components that would make it no more effective after its expiry date.
We all know that in a number of cases (food, medicines, materials) product expiry dates are artificially shortened to boost sales. In this particular case I suspect that if the official shelf life is 12 months, the real one could be anything in the renge of 36 months, with decreasing performances over time. My supposedly 2.5 years old glue takes considerably more than 15 seconds to become rock solid and miniclamps are needed to support the hardening process, but apart from this it delivers the expected result.
I'm just curious to see whether this empirical observation is shared by other people or I've just been simply lucky this time.
Best,
W.
Reply to
Woland
Well, according to one MSDS I found, solvent weld adhesive is 80% methyl ethyl ketone (MEK) and 20% cyclohexanone.
On its own, MEK is a thin clear liquid and cyclohexanone is a slightly thicker oily liquid.
Mixed together, they make a viscous liquid.
Over time, the (more volatile) MEK will evaporate faster than the cyclohexanone, so making the the adhesive thicker and slower to go off. Eventually, it may "set" inside the tube/tin.
The expiry date is mainly to aid in rotation of stock. Practically speaking, if you open the tin/tube and it looks all right, try it and it works all right, then it is all right.
HTH
Reply to
Rumble

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