New Gas Tank Sending Unit Leaks

I used the RTV gasket maker. I put a thin coat on the tank and then put in the gasket. I put another coat over the gasket, then put in the sender.
Again another thicker coat over the sender, then put in the ring.
I added more around the outside and inside of the ring.
Sounds gooey, I know.
I left it to cure at least over night. Then added a small amount of gas. and tipped up the tank so the gas covered the seal
first time I had a small leak. so I put more gasket maker around the ring, let it set
tipped the tank up again looked for leaks.
It works with no problems

Ed