If the oil is a drying oil, it may dry before absorbing into dense areas, such as wide latewood bands on flat- sawn lumber. The resulting film will appear as shiny areas on the surface. These oils penetrate the wood, but do not dry. They protect the wood from degradation and mildew attack as do other types of WRPs. Since the oils do not dry, the wood surface may remain oily until the finish absorbs.
Absorption usually takes several days, depending on the application rate and porosity of the wood.
Since the oil does not dry, there is the possibility of tracking it indoors, if this finish is used on decks. These products are easy to apply to decks and have about the same durability as other penetrating clear finishes. This pesticide is no longer available to the consumer. In addition, the fungicides listed in this Research Note are usually unavailable.