Since epoxy is a 2 part system, it keeps pretty well without being
totally sealed and screwing the cap on is usually enough. How long
would you plan on storing it?
As adhesives go, the epoxy based stuff seems far more robust than most
after you open it. poly urethane glues like Gorilla glue will go bad
in the factory sealed container and once you open the clock is
running. The same is true of silicone sealants
On 12/13/2015 8:56 AM, firstname.lastname@example.org wrote:
It "keeps" well enough (as in, retains it's effectiveness).
It just doesn't "stay inside" the container (toothpaste-style
tubes). Particularly the hardener.
Tubes were opened a little less than a month ago. Hardener
is noticeably "soiled" on the outside (yes, I put the caps on
Because I've never found a brand of epoxy that comes in toothpaste tubes
that doesn't? The plunger types are even worse though I think I've seen
some that come with a mixing tube that are meant for one time use.
This is my first experience with one that does! In fact, first
experience with anything that comes in a toothpaste-like tube
leaking out AFTER the cap has been firmly screwed on!
Medications, artist paints, other adhesives, toothpaste, etc. have
always "behaved". I've seen folks "squeeze too hard" or "in the middle
of the tube" and get more than they bargained for -- and neglected to clean
off the excess before replacing the cap. But, if there wasn't anything
actively oozing out of the tube when the cap was replaced, I've never
come back to find it having oozed "through" (around) the cap!
The dual-plunger (syringe) behave similarly; if you exert too much
pressure (for the viscosity of the contents), then the stuff oozes
long after you've "stopped pushing" -- as if the stuff is currently
compressed inside the tubes from your pressure and is now looking to
release that pent up energy.
The concrete adhesive that I use is a "two chamber", plunger-driven
sort of storage/dispense mechanism. The "nozzle" through which the
adhesive is dispensed is very long and contains a sort of screw-like
chamber that forces the two-parts to commingle *in* the nozzle before
exiting onto your workpiece. Of course, this makes the nozzle a
single-use item; PLAN AHEad!
Yes, that's what I don't like about the long nozzle. Single use and a
bunch of the material is wasted, inside the nozzle and no way to get
it out. Plus i know I can mix it well. I put it on a glossy piece
of cardboard, like the box from frozen food, or even from Ritz
crackers, and I stir it up with a kitchen match. It's true, if you
don't stir it enough it won't harden right, but I can stir it as well
as the long nozzle can. (which I have doubts about.)
I've always praised JB Weld. It fixes a lot of stuff, and has always
held up well.
However, I can not offer as much praise for their company. Some years
ago, I wanted to coat the entire bottom of a metal livestock tank which
was rusty. Those tanks are costly, so it was worth doing. I bought 5
tubes of JB Weld at a local farm supply store. Apparently it had been on
the shelf too long, and was very stiff and hard to get out of the tube.
In fact it was so hard, I had to press down on the tube with my shoe to
get it out. Then it was very hard to mix and to spread. After using 3
tubes, and cussing the whole time, I bought several more tubes elsewhere
and that worked fine. I tried to return the 2 remaining tubes to the
farm store, and they told me they said that it "cant be bad", and
refused to give me my money back.
I called the JB Weld company, and offerred to mail them the unused tubes
and those I had used too. (after explaining the situation). They told me
I would not have to mail them, and that they would send me 5 new tubes.
That was 4 or 5 years ago. I still have not gotten them in the mail.
On 12/13/2015 10:56 AM, email@example.com wrote:
Epoxies will keep for years. I've got stuff maybe 40 years old. Have
not used it lately but suspect it is still good.
They do not cure with moisture like the others you mentioned.
Gorilla glue bottles are polyethylene which is amongst the worst
possible plastic barrier resins.
Even ketchup is packed in better bottles.
That's apparently not true. I recently tossed an "almost unopened"
"Loctite 5 minute epoxy for Plastics" (siamese syringe style package) as
the hardener and resin *both* degraded -- stored indoors and probably
less than a year old.
OTOH, I recall painting the garage floor many decades ago with some
epoxy paint that was probably stored for > 5 years (in a sealed container).
Years ago, I was given a bunch of these tiny, "single use" packets;
sort of like the sealed "ketchup" packets but smaller -- resin and
hardener side-by-side. Fold in half (so the hardener and resin
packets are on top of each other). Cut the end off (scissors or utility
knife). Pinch end between fingers and slide fingers up towards
the open end to force both ingredients out onto a mixing surface.
No practical way fo saving anything "in" the packets so you didn't
even try! And, as there wasn't a whole lot of material there to
begin with, you never felt like you were discarding much!
I've found that "Krazy Glue Craft" holds up well! It comes in a
bottle like a nail-polish bottle (with a little "brush" applicator)
and screw on cap -- instead of those little squeeze tubes that
I agree with Vic. Buy the crazy glue stuff in small, "one shot" tubes.
The discount places sell them in a 6 pack for a buck or so.
I do buy epoxy in larger containers but I use a lot of it.
I have several different kinds for different stuff. It is a subtle
difference but a difference nonetheless.
The tubes of the syringe are 2+ inches long and half an inch in diameter.
You're expecting something AT THE TIP (which is the only place where
the contents of each are "exposed" to any "contaminants") to travel back
up through the dispensing nozzle and all of the "raw material"? I
could understand the portion of the material that had already "left"
it's nominal storage are in the tube(s) to begin the trip "out".
But, that would be easily purged by "wasting" some "spoiled" material
with the expectation that there would be virgin material waiting
"behind it". This nearly full ("almost unopened") unit was shot
through and through!
I have another unopened one that I will be watching carefully to see
if this is just a brand that I need to avoid in the future (it has
proven to be very good, otherwise)
I keep my epoxies and Gorilla Glue in the door rack of our kitchen's
freezer compartment. It takes very little time to warm them up enough to
use them. I've had a pair of tubes of electrically conductive epoxy
(expensive stuff that) in there for at least ten years and it's "good as
new" when I need to use a little bit.
i must admit that my 5-minute epoxy for plastics in a syringe is
dripping out of hte syringe, and I didn't notice, and now I have to
clean it up. I stopped it by pointing the opening up.
But other plastic siamese syringes have lasted for years. While some
have hardened after a couple years.
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