Bladeguard

Bladeguard: This clear resin protects a weapon from harmful attacks from oozes, rust monsters, and similar effects that corrode or melt weapons, rendering the weapon immune for 24 hours. One pot can coat one two-handed weapon, two one-handed or light weapons, or 50 ammunition items. Applying it takes 1 full round. Immersing the weapon in water or similar liquid washes it off.