The Polish Enhancer comes before the sealant. I used it on my 64 red Stingray and it looks great after using Menz 203 and 87 MC. The paint looked great but the polish enhancer really brought out the richness and depth of the color. I think you'll like it on your single stage red.
If you have...
I used this guide for scratch removal
Repairing Paint Chips & Scratches
I found someone had put a scratch about 7 inches on my truck. It was nasty looking to with paint chips and peels on the edges. It looked like it had gone through the clear and the paint down to the metal (lucky for me...