I did my 1st glitter tatt (freehand!) at a bodypaint comp in Wales this summer and loved it! Addicted now and looking forward to receiving the kit I won. So hope you don't mind but thought I'd post what I had learned. All the pics are from my 1st few booking so I'm still learning but I love it!
I now offer it as a service and its really popular Uk AND HK.
I don't use stencils; I leave that for the DIY table I offer as well (mainly for adults/ teens) where I have tiny kits of puffers etc made up. I reckon if they see me doing far more intricate unusual stuff they appreciate its an art and not an easy thing with a stencil they could do themselves.
Met a painter in UK who did it with water soluble spirit gum - OK, nice idea as it washes off but that glue is horrible to work with precisely and the whole point of glitter tatts is they are not so ephemeral AND are waterproof! Tried it over a bodypaint that way and it sucked. So I stick to Prosaide etc - body glues, the good ones by Mehron or Graftobian as i can get big bottles.
My BIG tip is to dye your glue - I add small crumbs of a strong colour of f-p (like wolfe) and shake it up until the glue is coloured. I have the glue in a sort of applicator tip bottle (not a puffer) and just draw it straight onto the skin. So when the glue dries I can still see it!

I have all my glitters in puffers, colours labelled so I can see if working in clubs and my headtorch is struggling. I stick to opaque glitter, having seen the effects from ones that aren't its a bit pointless. Also I have some of the mica powders which give a 'real' tatt effect - the guys love the fake maori tatt look at the rugby 7s.
This is an odd one -

she wanted 'bird wings a cat had chewed'. And don't get me started on the one who had a pic from the Kama Sutra she wanted on her back (I missed out the rude bits but boy that was hard).
I use an alcohol spray to clean the skin 1st; for the DIY table I have the wee rip open individual sachets for them. And tell them to wipe down the used stencil with it too.

Why do you all draw on the skin 1st? I would have thought that would waste time AND create a layer that would stop the tatt lasting as long? If you can draw it in eyeliner why can't you draw directly with the glue?

Drips are usually easy to disguise and I do try to get whatever i paint flat & horizontal which helps.
I now only use a brush for big areas on bodies; the rest is the bottle tip of glue doing it. Took a couple of practice tatts on me to get it but is great now.

Tip from bibi is to keep a small container of washing up liquid for your gloopy brush - stops the brush getting sticky, somehow, works better than the proper removers or alcohol!
This was a 1st attempt with a brush:

This was with the bottle - much better!

I clean stuff or do another glue on someone whilst waiting for it to dry, then start glittering. I have a great glitter tray i got from the UK - you know the kind? For glittering cards in - raised edge to catch it all then a plugged hole at the bottom end you can open to easily pour it all back into a glitter pot after. So i keep that under wherever i am doing the stuff, and just squirt (or dribble - depends on the hole in the puffer - I usually make them a bit bigger) asstd colours on. So you can be quite precise AND fast and not get a sticky brush if a bit wasn't dry.

Then brush around/ squish on and hey presto.

Know what you mean with the glitter sometimes sticking even when i wiped down with alcohol before. Here in HK we are very humid too. So i keep a few damp clean facecloths handy to get the worst off after brushing off hasn't worked. And tell them it will look even better the next day/ after a shower:)
LOVE the 'full' body tatts - have pics of the 1st torso test shoot i did and its fantastic to do as well as the end product. Think it may become my 'thing' especially as you can do it the night before and save such a stress if you have a load of bodies to do. Plus with rubbing alcohol the girl said it was not bad to get off in a hot shower.
She is wearing scuplted breast prosthetics...


What was interesting was to see even the pro photog couldn't get decent sparkles on the glitter - my own efforts the flash bleaches it out as well as losing the sparkle...
Cat x