This is an incredibly strong and versatile glue it permanently bonds a wide range of materials and keeps them bonded in all conditions. Hippo Expanding Glue can be used to bond wood metal glass stone brick concrete ceramics and foam. It expands to fill gaps so it’s perfect for joining dissimilar surfaces. Suitable for interior or exterior use it dries 100% waterproof. Once dry it can be sanded by hand and will accept paint to finish. Expanding glue is temperature resistant and therefore unaffected by extreme hot or cold conditions making it extremely durable.