What's your recipe?
I tried a myriad of ratios and never achieved anything of equal performance to the real deal.
I started with all equal parts as I had read on the interwebs, which took forever to dry. Then I started experimenting with more poly, less BLO, more turps etc. I even tried a bit of naptha (shellite). In the end I just gave up.
I have since heard of guys adding Japan Dryer, but haven't had the motivation to get into it again.