WoolWax® Black Lanolin Undercoating 5 Gallon Pail. Creates a thin lanolin film barrier to keep moisture and oxygen away from the base metal. Solvent free, environmentally friendly and always active and creeping into inaccessible areas. WoolWax® will thicken to a gel film after applying and is very resistant to wash off. Provides vehicle undercarriage protection for a full season. Enclosed areas (doors, frame-rails, rocker-panels, etc.), that are not exposed to road-wash will be protected indefinitely (years). This is the advantage of no solvents. There is nothing to dry up and evaporate.