Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to seal a plastic gas tank [title] Drain the gasoline from the tank and allow it to dry. [step] Sand the area around the hole or crack, and clean the area with a shop cloth saturated with rubbing alcohol. [title] Mix the 2 part epoxy together and apply all around the perimeter of the opening.

Ending1: [step] Leave a few inches or centimeters between the top layer of epoxy and the hard bottom layer of gravel so that you can accurately clean the area at the bottom of the tank and under the gravel. [substeps] Epoxy powder can be purchased at your local hardware store. Ending2: [step] Do this once each side is dry. [title] Oil the area with vegetable oil or margarine or another product you find handy such as lime oil. Ending3: [step] For smaller gas tanks, use a shoe-pad, and don't use anything too big as it will fill the hole. The epoxy is very thin, so it doesn't create a very good seal. Ending4: [step] Cut a fiberglass patch large enough to cover the opening and overlap it. [title] Place the fiberglass patch over the hole and press into the epoxy.

Answer format: ending1/ending2/ending3/ending4