Palmer Mirro-Mastic in a gallon can is the same high quality adhesive mastic that is in the cartridges. Palmer Mirro-Mastic is a high quality adhesive mastic formulated for adhering plate glass mirror and acrylic mirror to various substrates, such as drywall, wood, glass, metal, and tile. Mirro-Mastic is ideal for large mirrored walls, columns, and vanities. It has a one-year shelf life. Mirro-Mastic may be used with CRL Category Two Safety Tape Film that has been washed with a 70% solution of isopropyl alcohol (IPA). All applications must have permanent bottom support and mechanical fasteners. Palmer Mirro-Mastic also qualifies for LEED (Leadership in Energy and Environmental Design) Green Building Rating System credit.