I've heard more than once how much of a pain that kit can be. Looks great despite all the troubles you had!
I think metalizer paints are rather finicky. I've had good results, and not so good results. I have recently completed an F-101 Voodoo where I used the metalizer paints under the tail. I did use primer under the paint, and didn't have any ill effects. I sprayed it with their sealer as well. I think that makes a difference. Using plain clear coat doesn't seem to "seal" the metalizer paint. I thought it would, but it rubbed off my current project as soon as I started to handle it. I'm by no means an expert, and have only used the metalizer a few times, so don't take my word for it, lol.