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The main problem I have when adding details to miniatures with geen stuff is that it doesnt stick to the surface. For small details I usually use 2 parts yellow and 1 part blue and this makes the green stuff pretty sticky. However when I try to put it down on plastic or another layer of green stuff it usually comes off after a while, especialy if I'm adding a thin layer.

I wet my tools with water and make sure the model doesnt get to wet but eventually when sculpting with the wet tools the green stuff gets wet and comes off. Some times I've put a minor blob of super glue when adding small dots (like gems), this works ok but has a fair chance of screwing up the model big time.

Any tips?

I try to keep the touching surfaces clear of water when I go to bond it to a surface. Scoring the surface with large grain sandpaper/emery board/file or a hobby would be another suggestion, as it gives it some recess to get into.

Tiny (and I mean tiny) bit of Super glue usually does the trick. Just make sure it's on a spot that doesn't need sculpting.

As before, key any surfaces by lightly sanding or scoring.

Wipe any surfaces over with a cloth or wash minis and dry them, to remove any residues and grease before working.

For metals you can try lighter fluid or degreasers or even just wash in a bath of washing up liquid.

If you want to make a surface to build up from a spot of glue and a thin layer of green stuff over it works best.
If you want to get green stuff to stick to green stuff never wet the first layer. When I do fur cloaks I generally ensure the viable side of the "cloak" is smooth and unblemished while the side that the fur will be going on is rough and can take the next layer.
If it is a question of needing more time before the greenstuff sets maybe you should try some of the other modelling putties out there.