This effect is special to imitate the accumulation of dust in vehicles.
Apply the product by using a medium sized round soft paintbrush. Deposit the product onto your scale model around details, seams and in holes creating acumulated sand effects. Let the product dry for about 15 minutes then clean the excess using a brush dampened with Thinner for Washes. Use a fine pointy 00 size brush to apply more refined pin-washes where you feel they might be necessary such as in weld seams, wheels or around bolts and rivets.