The final colour of Bona Natural primer is strongly connected to the wood species it is applied to. The same type of wood may also contain varying degrees of tannic acid and other naturally occurring substances that affect the colouration. Bona Natural primer can be applied in one or two layers depending on the desired look. The more coats, the lighter/whiter the appearance. If unsure, test to ensure satisfactory colouration prior to use. To optimise the natural characteristics of the floor it is recommended to overcoat using Bona Traffic Natural or any other matt version of Bona Traffic.