For those who don't know what it is, this is a sealer. Shock and vibration resistance as well as exclusion of moisture and corrosive agents. Many people use this for a variety of applications, but the most common use is sealing OEM or aftermarket HID ballasts. This makes the ballast weatherproof and highly resistant to the shock and vibration your vehicle generates while driving. There is enough epoxy in this kit to make 4 HID ballasts. Just follow the instructions on the packaging. I had to speed mine up so I put it in the oven at 125 degrees for 2 hours and it was rock hard. I am very happy with the results. MG is the only brand I recommend and Revain has the best price for this set.