Here's a suggestion for you...ship it to me instead! I've been looking for a good (ie, cheap) Zeppelin kit for over a year now!
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(And to answer your first question, "blimps" don't have an internal skeleton, unlike "rigid airships," but people can correctly use the term "Zeppelin" for any rigid airship, regardless of whether or not it was built by Luftschiffbau Zeppelin.) Sounds like you got a good deal to get the Hawk Zeppelin for just $40...how's the fit on the few parts it has?
I'm not positive if this would work, but if the paint is having trouble sticking to the pieces, perhaps you could use a heavy-duty primer coat from Lowes/Home Depot...maybe that would be too thick though...maybe just a spray of Future would work. Assuming that Future will adhere to the pieces (and I haven't found a surface it won't stick to yet...), you can easily paint over it. Next issue!
Yeah, it will take a LOT of silver to cover that hunk. I use mainly enamels with a few acrylics because it's all I can get easily, but if you use Alclad, maybe that would work out for you? Although I always thought that Zeppelin doping was more of a metallic grey instead of a pure silver/aluminum/iron/whatever metallic shade you have in stock. Experiment around to get a base color (some kind of grey + metal mixture), then add varying ratios of white, light grey, more grey, dark grey, maybe even a tad of black, who knows? Again, I don't know your painting habits, so I can't exactly guarantee you'll like these suggestions, but you're free to take this intellectual property if you'd like it. I told you, I've been planning my Zeppelin for a long time!
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Finally, let me leave you with
this link from IPMS Stockholm about "NMF For the Masses." Pretty good strategy...I've used it meself once. Yes, it will take a while to mask out each color though. But time spent preparing is time saved cleaning up screw-ups, no?
I'm sorry to be so giddy here, but you don't know how excited I am that someone on this forum will be building a Zeppelin! If you have a build log in place, please post a link for me to follow you. If not, at least tell me when you're all done!