From my experience, use the best quality paint you can find. I went over a very
dark red with a yellow. It covered very well with one coat and perfectly with
the second coat. You can use a primer if you think it would help and have the
primer tinted to match the new color.
"Quickest"?? Depends upon your skills, equipment, product, temperment,
2 coats with a roller and decent paint.
Unless you're in a hurry. Then use 1 coat and just throw it up on the
wall directly from the can.
Dark to light or light to dark or one strong color to another strong
color is all the same. Use top quality paint and it is easy. Look for
paint with high hiding ability. Don't buy the cheap bargain stuff.
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