I have 2 holes in my Volkswagen's plastic gas tank. Was wondering if anyone's fixed plastic tanks before. The holes are on the bottom and I don't want to spend $600 on a new tank. I read plastic welding is a good way to fix it but I don't want to have to take the whole tank out. Is there a safe way to solder the plastic without removing the tank? (I've tried JB weld and a plastic fuel tank repair kit from autozone but neither of them held for more than a couple days.