Gtechniq C1 and EXO v5 Ceramic Coating Combo | 50ml Kit Crystal Lacquer | The Clean Garage. 3 to 12 hours after applying C1 to a car to make it scratch resistant, you can apply Gtechniq EXO Ultra Durable Hydrophobic Coating to give the paintwork unrivaled gloss, water, and dirt repellence, and slickness.