It is an ecologically safe oil lacquer that has been approved by the French navy for use on their boats. Le Tonkinois provides excellent protection from moisture and is suitable for both indoor and outdoor use. This makes it ideal not only for furniture in the house but also for wood lagging, windows and external doors as well as garden furniture. The oil lacquer is applied with a brush in several coats with intermediate sanding, similar to stains, and should be renewed after about 1-2 years (depending on weather conditions). We recommend diluting Le Tonkinois with turpentine oil for the first coat. Detailed application instructions are provided.