The first or priming coat on railway wagons is made of tub white lead, raw linseed oil, patent driers, a little common black, and turpentine. The quantities may be best judged by experience, but the following will serve as a guide. Put in lb. of white lead, lqt. of raw linseed oil, and about i lb. of patent driers in a large pot and mix well together, adding sufficient black to produce the desired tint. Strain through a piece of canvas and add just sufficient turps to make the paint work smoothly. The quantity of driers will vary according to the state of the surface to be painted and the quality of the material. The tint used must be made to accord with the finishing colour. For instance, if a light colour is desired, the priming and following coats must be light, so as gradually to lead to the finishing tint. For the second coat, the same colour may be used as for the first. For the third coat, oxide red', linseed oil, and terebine as a drier may be used.

For the fourth coat, half oxiae paint and half varnish may be used. For dead colours, the dry paint is ground in turpentine; a little gold size and varnish are then added and the paint thinned down to a working consistency with turps. Boiled oil may be used if desired with the finishing coats. It is necessary to remember however, that only very small quantities of boiled oil should be used if the best results are to be gained in finishing. Either terebine or gold size may be used as driers with delicate tints such as would be injured by using patent driers. Copal varnish may be mixed with the finishing coats, or it may be used by itself as a finishing coat over the last coat of colour. The materials used will vary according to the finishing tint. For instance, a blue wagon wonld be finished as follows. The priming coat would be lead colour, rather dark, as described above -, the second coat would be the same with a little blue mixed in; third coat, ultramarine or Prussian blue as a dead colour; fourth coat, the same, with halt its bulk of varnish. The writing and picking out would then be put on with two coats of dead colour, the last coat being clear varnish.

The usual practice is simply to paint with three coats of lead colour.