In using air-drying enamels on cycles great difficulty is sometimes experienced in getting a surface that is entirely free from brush marks. Assuming that the enamels are not stoved, the trouble may be due to one of the following cause.-. First, the brush may be too stiff: use a very solt brush with a big head and long hair. Secondly, the enamel may not be sufficiently thinned; add a little turpentine, when the coat of enamel will be thinner and more uniform, but not so lustrous. Thirdly, the enamel may dry too quickly; this is often the case with enamel paints, many of them showing signs of drying immediately after they are laid on, and such enamels show brush marks very strongly.