(S)3 Gallon Kit Resin Research Epoxy 2000 w/ 2100 slow Hardener
I was surprised to receive the S hardener... I didn't look first and there was no choice of which to get. For the past ten years I've only used the F. I'll use it and test mixing with the little F that I have left and see how it goes. Maybe get some X to speed things up when I need it.