Unwashable Seal

You create a magical seal on a solid, mostly flat surface within 20 feet. Anything directly covered by the seal is protected from liquids, heat, and non-magical corrosive substances, but the seal does not block physical force, gases, or energy. The spell fails if the surface becomes invalid, the target moves out of line of sight, or the target is a creature that is not willing, restrained, or unconscious. Somatic components are performed throughout casting, and the verbal component occurs at completion. Once created, the seal persists without concentration and can only be removed instantly by the original caster; another spellcaster of sufficient power can remove it only with a casting of equal duration if the original caster is incapacitated, or willing.