Has anyone used: Northern Factory RW125-9 Automotive Fuel Tank Liner Kit (About $55) to seal there gas tank. Most kits I have found are for 5 Gal. and are more expensive + I would need 4 times as much? I have read to cut the tank in half (filled with water) clean it and then weld back together. Just buy $400 tank? What is the common solution? Thanks in advance.