Offer them amber
From Fallen London Wiki
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From: Light Fingers: Hire Rubbery Men for your Crew
It's what they like, isn't it?
Unlocked with 
1250 x Nodule of Deep Amber, 
5 x Nodule of Trembling Amber
Success
Justified
The Rubbery Men don't seem to understand where you're proposing to go. Once they do, many leave. [...] Those who remain are tested [...] Not one of them passes every test, but willingness is as valuable as aeronautic experience on this voyage.
An occurrence! Your 'A Zeppelin Crew' Quality is now 2 - Rubbery Men!
You've gained 1 x Ready to Fly
You've lost 5 x Nodule of Trembling Amber
You've lost 1250 x Nodule of Deep Amber
