A little design... (based off portal 2) [space] Repulsion- Bouncy gel designed by aperture science in the 1960s Propulsion- Speedy gel designed by aperture science in the 1970s Conversion- Crushed-up moon rock for portals to go on- Made in 1980s Reflection- A custom modded gel that reflects lazers Adhesion- A gel in TAG: the power of paint that didn't make it to portal 2. Sticks stuff to walls Cleansing- One word: water. Cleans off other gels.