Sesster, it is a hair producted called got2bglued spiking glue. It is neither a gel nor spray, It is like a white cream type texture and u squirt it out of a tube. It is a pretty thick texture. I believe it is good for 1 to maybe five days? depending on the person. I never wore for more then 3 days so i dont know. Why it is cool to use is not so much about the bonding longevity but the ease of attachment and removal. there is no alcohol to worry about, or solvents etc. The product complete dissolves with just warm water, so no clean up. Its just fast and easy. I can attach the thing in the time it takes to take a piss lol If only it worked better on the front hairline id really love it.