| Anti-Corrosion.— | Slag from iron foundries, pounded | 12 lbs. |
| Chalk | 12 lbs. | |
| Soot, common | 1 lb. |
In applying lacquer, the surface of the iron must be first cleaned with a scraper and a wire brush, if necessary, and the lacquer applied hot, in two thin coats, with a paint-brush. It is best done in summer.
Old lacquer should be removed with a scraper, or by scouring, and not by heating the guns or balls, by which the metal is injured.
PLANTOU'S COMPOSITION FOR COATING IRON OR WOOD AS A PRESERVATIVE.
First composition.
| Pulverized rosin | 3 lbs. |
| Pulverized shellac | 2 oz. |
| Pulverized charcoal, or cannel-coal | 1 lb. |
| Spirits turpentine | 1 oz. |
Second composition.
| Pulverized rosin | 3 lbs. |
| Beeswax | 4 oz. |
| Pulverized charcoal, or cannel-coal | 1 lb. |
| Spirits turpentine | 1 oz. |
The first two articles are to be dissolved in an iron vessel over the fire; the charcoal is then added, and briskly stirred until the whole is well intermixed; after which the turpentine is added, and stirred until it is well incorporated with the other ingredients. It is not safely made on board ship.
The composition is to be applied when hot, with a brush or spatula, and smoothed over with a hot iron. The wood, or iron should be perfectly dry, and freed from rust or other loose substances.