@mrkovak very useful thread here
Future4200 Diluent Thread
1-3 Propanediol is plant based and may work for you, but low/negligible taste terpenes are common too in these products but yes they are spendy
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I need to use some odorless diluent to reduce the viscosity of some Cartridge Oil.
I usually go to a little more of Terpenes but one customer does not want more flavor.
I am looking for a PEG,PG,MCT or any other Lipid Free product.