[Dafni]

Anything above a 0.5mm nozzle should be fine. You can thin it with water.
I am thinking about buying a big spray gun, like the guys use to spray truck bed liner and stuff.

Here's a nice tip for you: Get a foam brush (from Walmart I heard) to brush it on. Wash it with cold water... it might still get hard and messed up after a few bodies, but for less than one dollar per brush it's not bad.
If you brush it on, don't worry too much about getting every coat super even, rather put an extra coat on.
And yeah, let it dry overnight before you peel, or even 2 days if you still have white spots. Half an hour between coats is fine.
Best LMF I ever tried is this Bob Dively stuff, btw.

Hope this helps

Daf