prior to applying fondant to a crumb coated cake...what do you use to ensure the fondant sticks?

I am mostly wondering about sculpted cakes with concave areas that you want the fondant to stick to define these areas.

I mostly see advice on using piping gel. I seem to find that this it globby, for lack of better word, and sometimes takes the crumb coat with it.

What else is there? will a simple syrup or spritz of water work?

I've done both simple syrup or water. They work great!

I just use a water spray bottle...works perfectly fine.

I misted water on the cake before, and it seemed to work okay.... I usually just roll my fondant out on crisco rubbed on my counter top... works for me!

Water works fine.