Using the Jet JT9-414125 coolant is easy. First, make sure your machine is turned off. Then, mix the coolant with water at a ratio of 20 parts water to 1 part coolant. Pour the mixture into the appropriate reservoir on your JET saw, lathe, or milling machine. During operation, the coolant will lubricate and cool the materials, helping to extend the life of your tools. Be aware that this product has a Prop 65 warning about cancer and reproductive harm, so handle it with care. Wear gloves and avoid direct contact with your skin. When it comes to maintenance, check the coolant level regularly and top it up as needed. Also, make sure to keep the coolant clean. If it gets dirty, replace it with a fresh mixture. This will ensure that your machine runs smoothly and your tools last longer.