paint_stream
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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.
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: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.