My incredibly scientific measurement was two squirts each. I let it sit long enough to put my bike duds on to go for a ride, so like 5 minutes, but they were holding well enough be fore I even walked away. If your grips are sliding off that easily, they may just be a little bigger than your bar. Are you using those Dimension grips that are everywhere? Mine were very slightly larger than a regular mtn size bar, but not as big as a road bar. They fit my Dimension moustache bar perfectly, and it's a weird in between size.