When exposed to moisture the adhesive reacts and creates a foaming action that fills whilst it sticks. Gorilla Glue has an open working time of 20 minutes and is incredibly strong, bonding all types of wood, including pressure treated wood. Gorilla Glue also bonds stone, metal, ceramics, foam, glass, leather and more. Gorilla Glue also bonds stone, metal, ceramics, foam, glass, leather and more. Once dried the product is sandable, stainable, paintable and can also take a varnish. Due to its foaming action the Glue gives greater coverage, so will give 3 times the coverage of other glues.