To use synthetic enamel paint, you can thin it with white spirit or synthetic thinners, which contain toluene. Synthetic enamels dry quickly, making it easier to apply by spray but more difficult to brush. It can be used on woodwork, iron and steel surfaces, plastered surfaces, and even old surfaces. However, before applying the paint, surfaces must be cleaned of dust, dirt, and external items. Uneven surfaces should be sanded to create a smooth and even surface. If there are holes, putty can be used to fill them in before painting. For an old surface, the old paint should be removed and the surface should be cleaned and sanded before applying synthetic enamel paint. A second coat can be applied after the first has dried and the surface can be rubbed with sharp paper to create a glossy and even look.