Gear spray is popular in cement plants, mining, Iron Ore crushers, kilns, and any external gear drive usually with a dry sump. The gear spray lubricant is periodically sprayed onto the pinion drive gear, large ring or slew gear. The lubricants on older installations use asphalt-based lubricants with a thinner. Newer installations use synthetic gear lubricants. Gear replacement is a major cost, most cases it forces the plant to be down for days.