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[Portal 2] paint_stream is a point entity available in Portal 2. It appears to manage gel that comes from info_paint_sprayers in some way. Killing one will instantly remove gel blobs generated by the specific sprayer entity it was paired to. This has no effect on prop_paint_bombs.

Note.png Note: Gel needs to have Paint in Map set to True in worldspawn before applying on surfaces. Maps that do not use gel can save significant resources by avoiding gel code.