
Sean H |

Nothing in the rules allows for that. As written, Defoliant Polish has only two effects:
1) A creature wearing armor coated with Defoliant Polish (the bearer) can move through difficult terrain created by plants and vegetation without penalty.
2) A plant creature who attacks or grapples the bearer takes one point of damage per attack.
Based on that, you could dip a plant creature in a vat of the stuff and it would have absolutely no effect.
Do I think that is silly? Yes. Would I run it like that at my table? No. However, doing anything other than that is firmly in the territory of houserules.
So to answer your question: No, you cannot throw a vial of defoliant polish as anything other than an improvised weapon unless your GM rules otherwise. If you elect to use it as an improvised weapon, the fine object will deal 1 nonlethal damage on a hit, with no other effects.