This alchemical gel comes in a large
vial with a brush built into the stopper.
It’s used to coat the surface of objects,
protecting them from a specific type
of energy damage. Though elemental
proofing is not harmful to the objects it coats, it acts as a
contact poison to living creatures. Touching elemental proofing
directly causes 1d4 points of damage and 1d4 rounds of
sickness (a DC 14 Fortitude save negates the latter effect).
Creatures immune to poison are likewise immune to the
effects of contacting elemental proofing but gain no benefits
from its application. When applied to weapons or armor,
elemental proofing confers resistances to the coated object,
but none to the wearer.
Each vial of elemental proofing contains enough gel to coat
one Large object, or two Medium or smaller objects. Once
the applied gel dries, it absorbs 10 points of the specified
type of elemental damage each round. Elemental proofing
wears off after 24 hours, and multiple applications of the
gel do not stack. There are four different types of elemental
proofing: acid proofing provides acid resistance 10, flame
proofing provides fire resistance 10, frost proofing provides
cold resistance 10, and lightning proofing provides electricity
resistance 10.
Does this mean I can use a vial of Elemental Proofing as a thrown weapon?
Bump.
Sure, why not. If you don't mind spending 100gp for 1d4 damage and 1d4 sickened with a DC14 fort save to negate splash weapon.
Obviously not an optimal choice.