As thread title.
I have some fast hardner in the container it comes in from EC and it has gone dark. I only realised when I had a new set delivered with my infusion resin.
My workshop has a constant 22-23 degrees temp and only on a rack away from sunlight.
Also is ok to mix equal amounts of fast and slow hardner to give me a little more time before my resin gels and not completes full infusion.
Thanks