Disclaimer: Colours and images shown may not represent the true colour. Colour reproduction can vary when viewing colours on your screen. For accuracy, always obtain a colour card or sample pot before deciding on your colour choice. British Paints H2O Enamel Semi Gloss is a water based enamel, designed for use on interior and exterior doors, windows and timber trim surfaces. It can be used in most areas traditional solvent based enamels are used with all the time saving and convenient benefits of a water based paint.