Re: 1/48 Boeing AH-64D Longbow Apache (Updated w/ Help Needed)

Too me it looks like it's binding at the blue box area. Nice and tight at the green. Before trying to fill a seam I would try to improve the fit. You might be able to judge if a tiny bit of sanding where it's binding is all that is required.

If so...just sand it bit by bit...and test fit often. Really bit by bit, just sanding a hair off and testing. That could sort it out without the risk of marring the clear with anything.