Ziggy, I've had that happen when the pure grain alcohol (PGA) ie. Everclear evaporated and the concentration got stronger. I just kept adding PGA, remixing and evaporating entel it got the way I wanted it.
I did separate out some that would not stay dissolved. I think wax and impurities will separate out first.
I did separate out some that would not stay dissolved. I think wax and impurities will separate out first.