I am Sooooo Confused over Paint

I agree that you don't mix products. Different manufacturers use different solvents in there products and, it can cause bad reactions such as lifting or crows feet. Epoxy first then, body work after that 3 heavy wet coats of 2K filler primer then, start blocking...priming....blocking...when you think it's good...prime and block again. After that I put 2 more wet coats of 2K on and wet sand with 400 to remove and sand scratches.

Your paint job will only be as good as your work is underneath it. I never paint a car that I didn't do the body work on....NEVER!!!
I only use PPG products and have never had an issue. Cleanliness is paramount when it comes time to paint....here are the last few I painted.

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