/diy/ - Do It Yourself

Question: What substance could I paint onto a print to make separating print from support 99% perfect?
Obviously I would pause the print at the right layer.
I was initially thinking some form of liquid, weather it dried or not, but probably a powder based substance like some kind of makeup, or chalky ultrafine powder would work.
It would need to be neutral as far as attracting or repelling the filament goes, but not so repellant as to make the layer being deposited on top of it form poorly... and not somethng messy that got mixed with the filament/everything that ends up touching it afterwards.
Thoughts?