I have poked a hole in my freezer, and lost the freeon. My freezer is plastic, the coils are embossed into the plastic. So, no metal coils

The coils are embossed into the plastic, no metal coils showing. What can I use on this plastic, to try to seal, the hole, without any of it leaking down into the coil. I tried JB weld, for water. Then had freeon put into it. Held for only a few minutes, and then all the freeon came out of the hole, wher the JB weld was. What will work on this plastic. Please help.