Formex Plastic Cement is a sealer and filler for use in patching cracks and breaks in roofing surfaces, firewalls, chimneys, gutters, flashing and foundation, etc. It can also be used when pointing brickwork, repairing flashing, tacking shingles and felts, and sealing metal building seams. It is ideal for patching before the application of asphalt roof coatings.