I made test prop at 200mg/ml using a 3/13 mix. I use this for everything else, even cyp at 250mg/ml and everything works perfect...Except the prop. After about 16 hours it started to crystalize bad. I then added the difference of BB to bring it up to a 3/18 mix and slowly heated it till it was a pure honey liquid, all crystals gone. That did not do it, as it started to crystlize again. Then I added the difference of BA to get to a 5/18 mix and it is holding perfect, no crystals. I really didn't want to go to 5%BA, but it is working now. Haven't shot it yet so don't know the pain factor, if there even is one. I'll post my pain report after tommorow morning when I sink that prop in me.