in the states, we buy small amounts like that in separate plastic squeeze bottles. Over time, the material will gel a little bit but a very small amount of heating, even +15C or something will make it flow again.
I only use epoxy for handles, and not always the same type. the last 500ml pair that I have (roughly that amount) lasted more than five years, though when I was going to use it, I did have to put the bottles upside down somewhere warm because the flow had decreased and would only flow freely in summer. It always dried hard.
Some of the 5 minute version is literally holding a very heavy sink up in my kitchen because when I installed the sink, i couldn't locate the new epoxy I'd bought to install it and I had limited time with my "installer" (my dad) helping. it's held for probably about four years so far.
I like the plastic bottles better than tubes because as soon as something gets a little slow in tubes, you often start to increase force to get it out and the result is usually splitting the tube. contact cement here is almost as cheap in a pack of 5 as it is two separate. I make the mistake of having several open at once when one is misplaced, and almost guaranteed, I will fight it (out of thrift) until the wrong end of the tube splits.
Thanks for the replies.
Further to my post earlier in the thread that I was going to try something different, well I have.
Our ice cream comes in 2 litre square polypropylene tubs and when empty I cut them up into little squares to mix the epoxy on.
Last night I mixed up a small brew on a piece of 3mm MDF and it cured rock hard. I will repeat the experiment again today.
Perhaps some component in the epoxy is reacting with the polypropylene resulting in insufficient curing. Perhaps the reason why the non-curing symptom takes a couple of months to develop is that's how long it takes for the polypropylene surface to degrade sitting on a sunny shelf in my shop after being full of ice cream sitting in the fridge, thereby affecting the curing. This sort of knowledge is way above my pay scale. I would like to know, though.
I'm not convinced on age and air affecting epoxy. I have years old West System epoxy laminating resin in half full plastic jerrycans. The screw caps are a bit gummed up and don't seal so very well and the hardener has gone dark with a strong ammonia smell. West System's website says this is not detrimental and the resin still cures ok for me.
Thanks for the replies.
Further to my post earlier in the thread that I was going to try something different, well I have.
Our ice cream comes in 2 litre square polypropylene tubs and when empty I cut them up into little squares to mix the epoxy on.
Last night I mixed up a small brew on a piece of 3mm MDF and it cured rock hard. I will repeat the experiment again today.
Perhaps some component in the epoxy is reacting with the polypropylene resulting in insufficient curing. Perhaps the reason why the non-curing symptom takes a couple of months to develop is that's how long it takes for the polypropylene surface to degrade sitting on a sunny shelf in my shop after being full of ice cream sitting in the fridge, thereby affecting the curing. This sort of knowledge is way above my pay scale. I would like to know, though.
I'm not convinced on age and air affecting epoxy. I have years old West System epoxy laminating resin in half full plastic jerrycans. The screw caps are a bit gummed up and don't seal so very well and the hardener has gone dark with a strong ammonia smell. West System's website says this is not detrimental and the resin still cures ok for me.
D-W: I agree with you 100% about tubes. But not much here comes in plastic bottles, except in sizes much too big for what I usually want.
that's a bummer - the bottles are some kind of relatively flexible plastic that make squeezing really easy and they never seem to degrade into hard or brittle. I am no plastics expert, so I have no clue what they are. they don't suffer the death of a CA bottle, either (glue setting in the nozzle, degrading the plastic until the whole thing breaks), thankfully.
The epoxy glue I'm currently using is Epiglue made by International Paints which is in turn an Anzio Nobel (spelling something like that ) company. It is regarded as the premium epoxy glue here in NZ and so it should be considering the eye-watering amounts of money they charge for the stuff.
The mix ratio us 2:1. Getting the proportions right in big batches is easy but not so easy on the tiny amounts I prepare. Whilst I'm reasonably confident with the mix ratio maybe a bit more attention to this is required.
I won't pretend to fully understand the chemical process/es and reactions involved Mike, and I certainly could not argue with you. But all I know from practical usage experience is that:There is a very big difference between an Epoxy and Polyester glue in the polymer chain, the Epoxy chain stays in line and is critical to its mixing ratio as the binder does not move on to cure any resin that has not been mixed in the correct proportions, in a Polyester the catalyst moves on down the polymer chain and attracts the chains to each other, hence polyester resin will shrink when curing, but Epoxy does not, polyester is not usually affected by moisture as its a thermic reaction, Epoxy is affected by moisture and at times will not go off or just reaches a rubbery state.
Slightly off topic but in a way related....
Many years ago as a kid I built my first control line model aeroplane. It was a kit solid balsa affair paw 1.5 engine etc.
I built it carefully with my dad painted it, and came to the fuel proofing which was two pack. I'd never heard of it before and my dad must have been working, I put one jar on without any knowledge of the hardener!
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