Johnstone's Trade Professional Undercoat is an oil-based product that can be applied by brush or roller. Suitable for interior and exterior use. Touch dry in 4-6 hours and recoatable after 16-24 hours. All surfaces to be painted should be clean, dry and free from all loose and flaking material. Prime bare surfaces with the appropriate Johnstone's primer. Key Features: Durable undercoat Tint into thousands of colours Available with next day delivery Available in around 16,000 colours.