Using a brush, but keeping it on one side of the object

[system]

I’m working on a thin surface right now, and whatever brush I use on one side, it changes the other side. How can I turn this off? (I checked symmetry already, it’s off)

[Moni-Poroni]

Turn on Backface mask --> Brush Palette. That`s all.

[system]

Thanks! It’s working now