+1 QFT    every client can be a different challenge...

Be especially careful about not mixing vehicle i.e. solvent types... oil base verses silicone based product... I've noticed issues here especially with cream product... staying within one solvent family for the entire suite of product used is always wise, eliminates a myriad of potential problems...   

When using silicone based TEMPTU S/B (my goto now) I always use TEMPTU's silicon based primer... this has worked well for nearly all clients... Additionally  this airbrush product is tenacious... very smudge resistant, in fact it won't rub off on a groom's ensemble... and brides can't even cry it off... tear resistant...

Yes I airbrush eye decor... albeit at the lowest effective psi since the nozzle is just an inch or so from the sensitive eye area...  find that bringing the gun in slowly with air only to allow the client to acclimate prior to releasing product works best in this scenario...   

hope this helps...

This!

Everyone's skin chemistry is different.  That's why products that claim to be waterproof or water resistant sometimes "fail" in the eyes of the consumer.  What they (the consumer) don't realize is that just because it doesn't smudge on me, that it's not going to smudge on them.  Perhaps their eyes produce more tears than others.  And also remember, tears aren't just water.  They're made of water, mucous, various oils and salt.  All of which eventually break down any makeup applied to the water line.

Darien, Vincent Ford who is a trainer for TEMPTU stated the following in a recent thread on Setting Powders

I have great respect for Vincent's knowledge and tenure... he is a constant source of wisdom on this forum...

hope this helps...