I actually just use to heat it in the vile itself briefly in spurts with a BIC lighter and never had an issue. I would put about a 1/3rd of the PG in first, dump the 200mgs of Etizolam in next and then put the remaining PG on top of it. Shake it up a little fand then hold the flame to it gently in 5 second clips, shaking it once again after. Never noticed any negative effect on the potency, and id make 5 viles in a short period of time. Id generally use 100ml's of PG to make each 1ml dose 2mgs which was enough for me without a tolerance to unwind at the end of the day.
Actually been thinking about picking up some Etizolam soon myself. It's literally the only drug in its class i could use somewhat responsibly. I've never blacked out on it once like the traditional benzodiazepines. Which I've sworn to my girlfriend I'd never use again. I'm hesitating on picking it up because i would hate for her to get pissed. I've thrown the idea past her and she didn't really say much, which is a pretty good sign. I do miss the flood of relief when the dose kicks in. Hmmm......