Blueskin WB Window and Door Flashing is a self-adhering membrane consisting of an SBS rubberized asphalt compound, which is integrally laminated to a blue-engineered film. The membrane is specifically designed to be self-adhered to a prepared substrate. Bakor Blueskin Weather Barrier is designed for use as a concealed self-adhered barrier against moisture or air infiltration, and it is commonly used to provide a weather tight seal around windows and doors, joints in sheathings, sealing around skylights and as a flashing in residential construction.