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Super Glue mini-bottle that doesn't harden by itself while stored capped?
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antenna:
Acetone eats several plastics, and just like heating HDPE helps glue stick, maybe the acetone is just to disrupt the polymer surface to do the same??
jpanhalt:

--- Quote from: Cecil on April 25, 2023, 08:46:59 pm ---I'm not sure if my acetone is wet.

--- End quote ---

Surprisingly, acetone and water do not form an azeotrope at atmospheric pressure.  Acetone boils at 56 °C and water at 100°C.  You could do a little experiment.  Take a sheet of aluminum foil shiny side up.  Add a couple of drops of acetone and let it evaporate slowly.  Don't add heat.  If there is a foggy reside, add thin CA to it and see if it sets off.  Unfortunately, aluminum may also set off CA.  So run a control with CA on fresh aluminum.  That would show that the residue is more reactive.  It does not show that the residue is water.  Anything shiny that doesn't cause the CA to set off by itself or melt with acetone can be substituted for the aluminium foil, e.g., some plastics, copper foil.

A negative result (i.e., no residue on the foil) means nothing as such a small amount of water may also evaporate at room temperature.
Weston:
I think it comes down to just having a good quality superglue. Anything sold for industrial uses with a part number is going to be better than a consumer product that likely uses whatever batch of adhesive the reseller could get.

I bought a bottle of 3M PR1500 off Amazon in September 2021, and the bottle has an expiration date of September 2022. I have used it quite a lot with no special precautions or storage, sometimes forgetting to put the cap back on for a few minutes. The bottle is about half full and I have not noticed any changes in the properties and I have never had any adhesion issues. Its sold as "High viscosity" but I would say its on the low end for gel type CA. A lot less viscous than honey and a little bit less than corn syrup? I have also never had any issues with it leaving white residues.

A bottle is $19 on amazon, which is a bit expensive. But having a reliable and repeatable adhesive is worth it in my opinion.

I can also second the use of super glue accelerator. I use Loctite SF 7113 because its explicitly designed for post application on thin interfaces, like gluing together ferrite cores, but I think most of them should work the same. Its really just useful not to be stuck holding two parts together while they cure.

Another good adhesive people probably overlook is UV cure epoxy. I use it in a lot of applications where I would otherwise use superglue.
Siwastaja:
Ignoring the "buy professional products instead of supermarket stuff" advice, there seems to be two opposite options to this classic problem:

1) Buy a super expensive overengineered brand bottle, which looks like a space station control room out of a Gillette TV ad. Hope it works out for longer time than the cheap ones; curse extensively when the cap design fails nevertheless (the chances are fifty-sixty).

2) Buy a massive megapack of those super tiny 1 gram (or similar) tubes, so you can keep them sealed in their original metal tubes and pop one when you most need it. While the space station glue thing costs you like 5€, you can get 10 of the cheap ones for 2€, so you get 25 uses for the same price, even if the cheap ones failed after each use. It's easier to accept the fact that they go bad once opened, and if you get 2-3 uses out of one tube during the next 1-2 weeks, it's only a plus.
Zoli:

--- Quote from: jpanhalt on April 26, 2023, 06:40:36 am ---
--- Quote from: Cecil on April 25, 2023, 08:46:59 pm ---I'm not sure if my acetone is wet.

--- End quote ---

Surprisingly, acetone and water do not form an azeotrope at atmospheric pressure.  Acetone boils at 56 °C and water at 100°C.  You could do a little experiment.  Take a sheet of aluminum foil shiny side up.  Add a couple of drops of acetone and let it evaporate slowly.  Don't add heat.  If there is a foggy reside, add thin CA to it and see if it sets off.  Unfortunately, aluminum may also set off CA.  So run a control with CA on fresh aluminum.  That would show that the residue is more reactive.  It does not show that the residue is water.  Anything shiny that doesn't cause the CA to set off by itself or melt with acetone can be substituted for the aluminium foil, e.g., some plastics, copper foil.

A negative result (i.e., no residue on the foil) means nothing as such a small amount of water may also evaporate at room temperature.

--- End quote ---
A year ago it was explained to me the secrets of the accelerator:
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4318879/#msg4318879
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