Clean out the contents of the refrigerator. Turn the refrigerator off. Wait until the refrigerator comes to room temperature. Dry any moisture remaining on the inner walls of the refrigerator.
Prepare a drill with a 1/8-inch drill bit. Drill one hole at the very end of the crack caused by the puncture. Drill another hole at the opposite end. The holes will prevent spreading cracks. Be careful to only drill through the plastic liner and not through the exterior, back wall of the appliance.
Wipe down the area around the puncture with rubbing alcohol to clean the plastic.
Squeeze out equal measurements of epoxy hardener and epoxy resin. Stir the two parts together with a small, flat, plastic knife.
Apply the mixed epoxy over the puncture with a plastic spreader, forcing it into the crack and smoothing it even at the surface.
Leave the epoxy to harden, following the wait time in the manufacturer’s instructions.