I have to say, I'm rather glad that I never got a reply.
On their Kickstarter page for the Airspeed it says :
For those unaffected, you still have the option to exchange Hesalite for a hardened glass case. For an exchange, please email us at info@cjrwatches.com and we will gladly ship dispatch the replacement goods to you free of charge. However, CJR is not responsible for shipping cost on your end.
Although a followup update seems to backtrack on that and requires you to send them your watch (and, obviously, never see it again).
This was now 4 years ago, though.
I copied the above into an email and sent it to them, will be interesting to see if I ever get a response - I assume I won't.
Their response (and rather unfriendly responses from another brand in HK) put me off Kickstarter watches for a long time, but I've been lured back in by a few recently and actually have 3 inbound later this year - Hopefully, I'll have no issues with them.
Realistically, assuming a watch arrives, you're pretty much on your own if you have problems (I fixed my Schaffen myself after they seemed very unenthusiastic about taking it back!).
M