Woolwax 6 Spray Can Undercoating Kit. Straw (Clear) If you don't have a compressor, you can still treat your vehicle with Woolwax . We are now offering a Woolwax aerosol spray can undercoating kit. 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. 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 will provide undercarriage protection for up to 2 years.