Nikwax Wax Cotton Waterproof Clear Spray - 300ml The Nikwax wax cotton waterproof clear spray is a speciality waterproofer designed to add durable water repellency and restore the finish of waxed cotton garments. Easy to apply by hand, non flammable, PFC and aerosol free. For waterproofing waxed cotton. Waterproofing spray Features: Easy to use spray-on waterproofing for all waxed cotton clothing and gear. Adds water repellency and increases durability. Enhances the performance of your gear, keeping you warmer and drier. Recommended for Barbour, Belstaff and all other waxed cotton clothing and gear.