I rarely see anyone using intercoat on a simple two tone job like that. Takes extra time and really isn't necessary especially on a plain old solid color. I never do it.
Although yes it would help the OP to do this. But only to a point. Intercoat is not clear, just clear basecoat binder and even activated will have solvent issues like the OP experienced if it is sprayed on heavy like the OP did.
@zachm Interesting. I've never heard of that. What happens when the tape warms back up to room temperature in a few minutes? How is it supposed to help? In my experience the biggest issue guys have with fine line is not pressing it down enough to completely seal.sit against the surface. And not peeling it back over on itself when removing. 3M stuff works fine as long as you really press it down.