Ghost Tool
Hide faces you don't want to paint through, so strokes never bleed onto the far side.
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Final video is on the way, thank you for your patience!
The Ghost tool hides faces from the render mesh so you can paint freely without hitting geometry behind them. Hidden faces are excluded from strokes, fills, and lighting bakes.
It offers additive and subtractive lasso sub-modes (marquee) to quickly trim away whatever is in the way of your stroke.