Pre mix additive F for RR travel repair kit?

I’m putting together a patch kit for my mexico trip, and I want to premix the addtive F so I don’t have to carry three components with me.  Should I mix it with the hardener, or the resin?   Or is this a bad idea alltogether?

Put it in a container that you can shake and I think you can do it.  Of course add F isn't as nessasary for ding repair either.