Getting kind of tired of this

The second attempt to patch the gas tank has failed. I did an overnight test (like I did the first time) for leaks before putting everything back together. The next morning, it was leaking. I didn’t even get a chance to put it in the cart this time. I have decided that I need to weld it back together. This seems to be the only, and correct way, to fix this thing. I was watching a car show this morning. They were doing a modification on a truck and had to mod the coolant overflow tank. They cut a portion out and welded it back together with a heat gun. Man, they make it look so easy so I decided this is what I will do. Now I found that locating a heat gun is just about as difficult as finding glue that will stick to polypropylene or finding a used gas tank. If I knew for sure I could fix it this way I would spend the $25 for a heat gun. Possibly I will buy the gun and give it a try. If it works, I will keep it and consider it a $25 repair. If it doesn’t work I will take the gun back and get a refund. I would also like to find some filler to add to the joint for added security. I was hoping to use something on hand like a milk jug or plastic water bottle but I found they are made of Polyethylene. It is best to use similar plastics. It’s amazing how much knowledge you can gain on something you will probably never do again.