Gripfill gap filling adhesive is a high strength general purpose adhesive that will bond most building materials together. It's suitable for both indoor and outdoor use but the bond needs to be covered when used outdoors. It's high strength means that it will bond almost any surface regardless of the unevenness. All surfaces need to be clean, dry and free from dust, grease and other loose materials before use. Any new concrete and plaster should be fully dry before using Gripfill Adhesive.