Quote Originally Posted by Pegasos989 View Post
The idea strikes to me as somewhat odd as 1d6 Acid can't even pass hardness 5 most of the time, 1d3 never.
Hardness, I believe, only affects physical damage, as in, I whack it with my sword. Acid damage, just like fire, sonic, etc. is not reduced by hardness or damage reduction. When you think about it, though, any decent 1st level fighter can keep hitting a wooden door with his sword until it breaks, and at higher levels all it takes is an adamantine weapon to be able to break through almost anything.

Are you worried about them bypassing locks they shouldn't be able to? I think it's actually a creative way to get around a poor lock-picking skill or something like that. Just make them keep track of how many acid vials it actually takes to eat through the hp of the door or lock and remind them that they'll end up spending a decent bit of money on this after a while.