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There is a Legacy version here.

Oil of PotencyItem 2+

Consumable Magical Oil 
Source GM Core pg. 257
Usage held in 2 hands; Bulk L
Activate [one-action] (manipulate)
When you apply this thick, viscous oil to a weapon or suit of armor, that item immediately becomes magically potent. If the item is a weapon, it temporarily becomes a +1 striking weapon, or, if it's armor, it temporarily becomes +1 resilient armor. This lasts for 1 minute.

PFS StandardOil of PotencyItem 2

Source GM Core pg. 257
Price 7 gp

PFS StandardOil of Potency (Greater)Item 12

Source GM Core pg. 257
Price 400 gp
The weapon becomes a +2 greater striking weapon or armor becomes +2 greater resilient armor.

PFS StandardOil of Potency (Major)Item 19

Source GM Core pg. 257
Price 8,000 gp
The weapon becomes a +3 major striking weapon or armor becomes +3 major resilient armor.