Flashing Strip is a self-adhesive bituminous sealing strip which bonds instantly to provide a permanent watertight seal. Uses: Bonds to most building materials including masonry, brick, concrete, wood, slates, metal, concrete roof tiles, glass, plastic and roofing felt. Flashing Strip is used for the following:- Repairing lead flashing, sealing valley gutters, repairing leaks in guttering and drain pipes, protecting insulation for pipes and tanks, repairs to greenhouses, repairing roofing felt joints.