I'm interested in hearing from anyone who has used the Gas Tank Renu company. I have a tank that desperately needs cleaning but when I called their Houston dealer he said they drill a bunch of 2" holes in the tank during the cleanout process, then patch them up and coat the tank inside and out. What do all these holes look like on the outside after they are done? My tank looks OK now on the outside and I'm concerned the patches will be visible. Also would like to know if anyone has had problems and used their "lifetime warranty", how did that work? Thanks!