That's because everything is so deftly and subtly done. The roof is raked in front, it looks like the entire windscreen has been lowered. The Foose truck's roof has been altered much in the same way that Moebius inadvertently (?!?) chopped their F100 roof...it's too low, too flat, raked in front where it should be peaked in front. If you were to fix the Moebius roof, you'd basically be doing much the same to take the Foose truck back to stock. Most builders don't seem to notice (or care) how far off the Moebius roof is, where it sticks out like a sore thumb to me for some reason (when built stock at least). The effect on the Foose truck is so natural it looks nearly stock. I love the subtleties of the Foose truck, it's not meant to be a radical custom, but just perfecting the proportions, and I'm looking forward to building one.
The Molotow pen isn't a good replacement for foil around windows. It's best for smaller pieces like door handles, mirrors, dash knobs, and repairs to small areas that might have a void in the foil or where you clipped a chrome part from the sprue. I suspect your main problem may be the use of Bare Metal Foil's "Ultra-Bright" chrome. If that's the case, I suggest trying a sheet of the "New Improved" regular foil. It looks less shiny on the sheet, but it lays down much smoother, has a more in-scale appearance, and it can be polished to a bright sheen with the same compounds used to polish paint. Some people swear by "Ultra-Bright", I just swear at it. I didn't like the appearance, how it cut/trimmed, and the lack of adhesion vs. the regular foil.
The only cans that I've had this happen are "modern" Testors lacquers. A friend w/a large stock of it has seen many of these failures over time. "Testors, it's always something"...should be their motto for rattlecans None of my Tamiya sprays has done this...yet.
Superb work all the way through, and happy that you played your hand and "gave away the farm" to document the build. If it inspires just one person to stretch their wings on a similar project, you've succeeded. Congrats on the win, can't wait to see this in person.
Glad to help! I'm going to spend some time this weekend testing what I can do w/the contents of my 4mm pen running through my airbrush. I want to thin it, I want to see how pieces that are dried react when dipped in Future. Normally I hate Future, but a friend tried it on some bumpers I airbrushed w/Molotow for him and he said it barely made any difference. So I'd like to see how it compares w/Aqua Gloss. Aqua Gloss didn't work that great for me on Spaz Stix chrome recently. It was much better than any other clear I had tried, including Future, but it still wasn't acceptable. Perhaps 40% reduction in reflectivity. I had far better results over Alclad black chrome. Oh, and your model is flat out brilliant! Love it. Can't wait to see it, have a great time at the show tomorrow! Hope you can make it to NNL East.