Perm-A-Barrier Liquid Flashing is a fluid applied, one component, membrane that cures to form a durable, resilient, monolithic and a fully bonded elastomeric flashing when applied to existing or new construction. It is an accessory to the Perm-A-Barrier portfolio of air barrier products. Perm-A-Barrier Liquid Flashing membrane protects window and door rough openings from the damaging effects of air and liquid water ingress on building structures.