Hi Roz
Sorry I missed your post. No mixing up a batch of finish that is not 50/50 it will most likely not set properly. It doesn't matter if you use 60% hardner. They make finish to be mixed 50/50 and thats how it should be done. Some finishes are better then others and you can get the mix a little off and it will still set up. But that is why I always mix at least 2 or 3 ml each of resin and hardner (so I have more room for error) and when I finish mixing it I mix it some more just to be sure. I would rather throw away a ml or two of finish then have to rewrap a rod.