The 16 oz. Pour-N-Go BlueDevil Head Gasket Sealer is designed for the Do-it-Yourself customer who may have limited time or lacks mechanical expertise. Here are the instructions for using this coolant leak sealer: Preparation: IMPORTANT: Ensure the engine is cold before starting the process (Steps 1-5). If the radiator is full, drain down the antifreeze to create enough capacity for BlueDevil. Application: Start the engine while cold. Turn the heater on to maximum. With the engine idling, SLOWLY POUR BlueDevil into the radiator. If your vehicle lacks a radiator cap, you can pour BlueDevil through the top radiator hose. Take approximately 1 minute to pour the entire bottle. After pouring BlueDevil slowly, replace the radiator cap. Idle and Monitor: Let the vehicle idle with the cap on for 50 minutes, maintaining normal operating temperature. Top Off: Top off the radiator with antifreeze and water. Safety Precautions: KEEP OUT OF REACH OF CHILDREN. Avoid eye or skin contact. If irritation occurs, rinse with cold water. If swallowed, drink large volumes of water and consult a physician. Remember, this product provides a permanent leak repair and sealant for head gaskets, heater cores, freeze plugs, and cooling system leaks.