USP or not?

dirkdiggler9969

New member
Do all you guys use usp oil or do you just use normal oil? I am planning some powder conversions and can get Cottonseed and Grapeseed for a fraction of the price. Normally, I would just buy the best but I am making a good amount of Prop and could save a lot of flow by just using normal oil. I'll run it through a whatman obviously? What are your experiences?
 
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