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My Vote would have to go with the Zaino Brothers' Products.
They are not a true wax but frankly they cannot be beat.
I use them on my daily drivers as well as the Cobra and all my previous weekend drivers.

I especially like their tire dressing product. Dark, lustrous and dry.
Makes tires look like new.

My ERA is a very dark blue with fine metalflake.

Tip... if you ever get a tiny rock chip in the front of the dark blue car and you are wondering what to do to hide the chip here is a trick I learned at a recent car show.

Get a blue permanent magic marker, preferably the type with a thin point Sharpie brand. If you gently use the Sharpie on the tiny chip it will dye the undercoat blue. The chip will essentially be invisible. A dab of clearcoat nail polish on the tip of a toothpick can then be used to fill in the surface. A few days later if you use Zaino swirl remover polish on that area, your result will be essentially a totally hidden chip.