Mercury - Quicksilver Primer Paint Light Gray Enamel Spray Marine Finish Prep 802878Q52. Overview. A great finish starts with the right foundation. The Mercury Marine 802878Q52 Quicksilver Light Gray Primer Paint gives your marine surfaces the ideal base for an even, professional-looking finish. Specially formulated for engines, drives, and propellers, this 12-ounce enamel spray primer helps your topcoat bond better, resist corrosion, and last longer. It's the same high-quality primer used by Me