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Cardboard can be spray painted to seal it for temporary water tightness just like wood. two coats. let the first one dry overnight would be best.
You could also roll it with an oil based paint for an even better water repellant finish but then I'm not sure how recycle-able that would be.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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