The best way to deal with/prevent punctures on tubular tyres I recently picked up some rather expensive tubular wheels on the back of a lot of advice to do with rolling resistance, comfort etc. However I've recently found I'm quite afraid to use them on long training rides for fear of getting a puncture in the middle of nowhere. I'd like to know what people do to prevent/deal with punctures on tubular tyres.
You could try adding sealant to your tubular tire.

Tufo Tire Sealant, Stans's No-tubes (and other tubeless sealants) can be used to deal with small punctures. Most recommend not using the sealant as a preventative measure, but more so as an after the fact solution to quickly fix punctures on the road.  

However, Tufo Standard tire sealant says that it can be used as a preventative measure, but I can't speak for this. I've heard that it could affect ride quality, so it may be best used in a roadside emergency.