It's common for old epoxy to crystlize. That can be countered by putting th container in a bucket of hot tap water. Old hardener can darken or turn red. There is no fix for that except use it where it won't be seen. But, if you can't get it out of the container, I think your stuck.

: Hey fellow boat builders. I'm about to start my Redfish Golden and
: have some Raka epoxy left over from the canoe I build over 5
: years ago. The resin is very thick and won't pour. Do I need to
: pitch it and buy new or is there a way to make it useable?

: Thanks,

: Patsy