The Autumn Mix Driveway Holding Dust is essential under Autumn Mix Gravel Pathways & Driveways. Why ? It holds the Autumn Mix Gravel and stops it from moving under your feet and tyres. How ? 1. Spread the Autumn Mix Holding Dust 25mm deep on your driveways surface. A bag of Autumn Mix Holding Dust purchased from www.wesellstone.com will cover approx. 24m2 at 25mm or 1 inch thick. 2. Spread the Autumn Mix Pathway or Driveway Gravel 25mm deep ( one inch ), on top of the Autumn Mix Driveway Holding Dust. 3. Compact it using a vibrating roller, hired from your local hire depot.