151 Hard as Nails Exterior is an instant grab, high strength adhesive. It has been specially formulated to withstand low temperatures so it can be used outside in colder weather. 151 Hard as Nails Exterior eliminates the need for nails and screws in many DIY jobs. It is ideal for fixed skirting boards, dado rails, architraves, plasterboard, plaster and polystyrene coving, carpet and grippers etc. to most building materials, as long as one surface is porous. This ultra high power adhesive is suitable for uneven surfaces because it fills minor gaps. 151 Hard As Nails Exterior is ideal as it dries white and can easily be painted when dry.