Woolwax 12 Spray Can Undercoating Kit Black. . If you don't have a compressor, you can still treat your vehicle with Woolwax. This includes a conversion trigger made to fit the Woolwax 12 oz can, that turns the spray can into a spray gun. Also included in a 24" extension wand with a 360° nozzle to get inside the doors and tight spots.This kit is especially good for people that may not live in the heavy snow and ice areas, but still want to protect their vehicles, boat trailers, outdoor equipment and more. The conversion kit can be used with or without the extension wand. Woolwax is formulated with more woolgrease than any competitive brand. Woolwax is thicker and more resistant to wash-off than any other lanolin film product. Woolwax does not dry. When applied Woolwax will create a wet gel-like barrier that moisture and oxygen cannot penetrate. Without moisture and oxygen there can be no oxidation. because Woolwax is non-drying, it is always active and migrating into the inaccessible areas of the doors, seams and folds of the sheet metal, and all the other difficult to reach areas. Woolwax is very thick and will not wash off easily. Woolwax will provide undercarriage protection for up to 2 years. . In the enclosed areas, (doors, frame rails, rockers, etc.) the Woolwax will provide protection indefinitely (years). It is only the exposed areas of the undercarriage that should be touched up every coup,e of years.