The method of gilding on truck bodies varies somewhat, depending upon the type of "paint job" on the truck. Methods that are satisfactory with a varnish job, for example, are not so suitable as others with a synthetic finish. No wax, grease or oil should be on a surface to be sized. Wax that may have been polished with a mechanical buffer is very difficult to remove with solvent. The only sure method of obtaining a clean surface in this case is to sand the entire panel before application of the size.
Polish can be removed by gasoline or benzine but great care must be taken to be sure the polish has been removed and not just smeared around. It is best to go over the surface several times, using a clean rag each time. It is usually possible to determine the presence of wax or polish by rubbing a finger on the finish. A streak will show up if grease is present.
Always use a quick, hard-drying size where the lettering is to receive a protective coating. On modern finishes, best results will be obtained by using a size designed for this use, such as Quick Drying Size. If no protective coating is to be applied, either a quick or slow-drying size may be used. As in all exterior surface work greater durability will be obtained with the slower size.
Remember, using Gold Leaf on Rolls can save time on many jobs. Never apply a protective coating over leaf until the sizing is hard dry. The best assurance of long life is when the panel has been sanded to a clean surface to receive the size and leaf. For this surface a clear coating or varnish compatible with the finish of the panel must be used.
When lettering, applied to a highly finished panel, is pencil varnished, it is also advisable to use a varnish for clear coat similar to the liquid used as the base in the panel finish. Satisfactory results can be obtained by using a long oil exterior type varnish, providing it is not brushed out too thin. A flow coat or even two coats are advisable to prevent early breakdown.