Adhesion Gel

The Adhesion Gel or Sticky Gel, was a unused gel type scrapped from the final release of Portal 2 and can only be found in the Portal 2 Authoring Tools.

Function

The gel was supposed to "paint" the floor, walls or ceiling and the player could walk on the walls and ceiling of the Test Chambers to resolve the tests.

Problems

According to the Portal 2 developer commentaries, play testers were too disoriented when they had to think with portals while walking on walls and ceilings. Valve had ultimately scrapped the gel as a result.

The Adhesion Gel was eventually replaced with Reflection Gel after an update to the game, which uses the same textures as the Conversion Gel. The updated gel is not found in the game, but it is usable to redirect lasers with.

Demonstrations

Since textures of the adhesion gel still exists along with its indicator signage, various community map makers have attempted to incorporate the gel into their maps from scratch as the entity itself no longer exists.

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Trivia

• The Sticky Gel was initially meant to function the same manner as the blue stick paint in Tag: The Power of Paint, the game off of which Portal 2's gel mechanics are based on.

• Sticky Gel's only function left on the code of Portal 2 is make a object that is covered by it doesn't be affected by the Propulsion Gel.

Gallery

See also: Portal 2

Stick Paint from Tag: The Power of Paint, the game that was based the Portal 2 gels.   A cube covered by the Adhesion/Sticky Gel, in a modded Portal 2.