Designed to waterproof difficult flashing conditions, it offers an alternative to traditional flashing technology. MajorSeal™ Liquid Flashing offers an alternative to traditional flashing technology to waterproof difficult flashing conditions. MajorSeal™ Systems combine MajorSeal™ Liquid Flashing and RoofMate™ Flashing Fabric to form a durable, redundant flashing membrane. Available in a convenient, easy-to-use kit, MajorSeal™ Liquid Flashing is a VOC-compliant, one-part moisture-curing grey polyether sealant.