This method was told to me by a HD guy so take it for what it's worth.
Get your handy dandy little hot glue gun out, hot glue a piece of wooden dowel to the dent. Let cool for one hour. Pull dent off. Heat with hair drier, glue comes off.
Sounds iffy to me, but hey, ya never know. Acetone won't hurt the paint, maybe hot glue won't either?
Maybe Pete can try this with the plethera of tanks he has.
