You can do either! PSO is really not a pre-shave oil, it's a shave oil.
1) Wet face
2) Drop about seven to 10 drops into palm of wet hand
3) Rub hands together
4) Spread oil over face
5) Wet face again (activates the oil)
6) Lather face (if shaving with shaving cream/soap . . . )
How do you use the PSO? Apply to wet before lather, or instead of lather?