G'day Stu,
I always think that tanks with painted silver sides are full of bog (bondo)
& it puts me off, I like to use the original stuff though. My opinion only,
but I would use the already chrome tank, once you've painted it & lined
the chrome sides, no one will know the diff. I have a 4 gal. tank thats
a spare, & has a few minor dents, I'm going to lead fill it for chroming.
I've heard its not easy, but I'll give it a go. Lead fill could be an option
for your other tank, depending on how deep the dents are.
regards, Cus