Ahh, here's what I've done. Take out the tank remove the send unit, put in a hundred or two hundred drywall screws. Then attatch the tank to something that turns slow, like the wheel on your tractor, go for a slow drive. I sadly don't have a tractor, so I've do it by jacking up the back of my one ton, and letting it idle in low with the tank strapped to the wheel.
I'm too-cheap to pay. I'm also too cheap to line a tank, unless it has pinholes. Even then, I'd probably just use seal-all for the pinholes.
