I have applied the "professional" stuff on another area of my door. All 6 coats are done now, I'm just waiting for the final coat a bit longer before I sand and polish. It already seems a little harder to scratch but its way too early to make any conclusion.

The non-professional stuff i posted pics of, I can still scratch the paint. I have to dig my fingernail in first, then push down. Its not easy to do. I've tried slashing it with a screwdriver, and when I do that the best I can do is to put a scratch in it but it doesnt' go all the way to the metal as when I use my nail.

maybe i have super fingernails.. but i'm hoping to test both of them in a few weeks and see that i can't scratch either.

so far the pro stuff smells, looks and acts just like the non-pro stuff. I wish I had some documentation as to an actual difference, but i guess i'll take their word for it.