roughbert
Member
I have a couple of packs which are time-expired and have been exposed to below zero degrees Celsius. Mixed a bit up and yes, it does not go hard. Is this material good for anything? Is it just the hardener that goes off?
Uses for time-expired West System epoxy
- Thread starter roughbert
- Start date
lustyd
Well-Known Member
I believe the main use is to deter you from taking them up on the bulk buy next time and making you realise that smaller packs are actually sometimes cheaper. I realised this with the overpriced Sikaflex toothpaste tubes a while ago after binning many nearly full big tubes 
cliff
Well-Known Member
Had some myself and on the advice of someone "in the know" I heated the resin and hardner by placing the containers in a pot of boiling water and stirred the contents of each container seperately until all lumps were gone and both the resin and hardener were clear. The containers were allowed to cool to room temp stirring occasionally - result - damn stuff worked like new after mixing in the correct proportions whereas before it refused to set hard.
lw395
Well-Known Member
I have recently used some that took a long time to go hard.
When it was not hard after 48 hours, I warmed it to about 60degC with a hot air gun.
A day later it was hard.
I'm using it as filler with glass in, on the trailing edge of a dinghy centreboard, so not a crisis if it fails.
For critical work, buy new.
The dodgy stuff is the dregs of a kit that is at least 4 years old.
When it was not hard after 48 hours, I warmed it to about 60degC with a hot air gun.
A day later it was hard.
I'm using it as filler with glass in, on the trailing edge of a dinghy centreboard, so not a crisis if it fails.
For critical work, buy new.
The dodgy stuff is the dregs of a kit that is at least 4 years old.