Airtight Oil

Wondrous item (potion), Uncommon

This oil is perfectly clear and smells of burnt steak mixed with roasted rubber.
Spreading this oil on a piece of clothing or armor will imbue the wearer with immunity to exposure to vacuums, as well as the negative effects of being in high pressure environments. It will not provide breathable air.

Additionally, this can be spread over any object or vessel up to 10 feet x 10 feet in size. Doing this will make it airtight.

Applying this oil takes one action.