I’m on the learning curve with lead flashing.
I get the impression that planation oil is used on new lead which has not yet formed the dark gray oxide layer and that once that has happened, there is no need for planation oil.
The lead sheet roll I’m working with is at least 70 years old - so it is nice and dark.
So I may not need PO.
However I would like it to be white to match the other flashing on the house.
I suspect boiled linseed oil with white pigment may be the stuff to use.