Yes, I put on a couple of mist coats, then apply a medium coat then my wet coats.
None of the so called Chrome spray cans are Chrome. Just shiny silver
Never had any luck with rustoleum or krypton. You can spray both over Duplicolor, but not vice versa. I've never had a problem with Duplicolor primer or color.
I've had nothing but trouble with both. Use what you want. You asked for advice, mine is use Duplicolor, avoid the other 2. You can use any paint over it. I've been in the finishing industry for 36 years, I know a little about it.
I strictly use Duplicolor primer/filler. Krylon sucks, as does Rustoleum. Either are asking for trouble, especially under Duplicolor paints. They are far too hot for either of those primers. If you've done it, you were lucky.