Thanks, FrankenWashe!
I used 400 grit pretty vigorously on the lighter section to remove some blemishes, and that, I think, is what produced the effect I’m seeing.
For the extremely light sanding back, would you recommend a lower or higher grit paper? I think this is my only option at this point because the wood doesn’t appear to be taking any more of the finish.
And I’ll definitely try the Goo Off and wire brush; I didn’t even see the glue around the border before I started the finish.
I’m not too worried about the results of the looks for this—this is my first build, and really the first time I’ve done anything with my hands like this... really ever. =) It’s a learning process and I’m grateful for your ideas.
Thanks again!