You want the easiest, no-hassle way to install AND remove your grips? Forget about glue, paint, hairspray, soap, knives, and scraping grip remnants from your bars. Forget about waiting 8 hours for adhesive to dry before riding your bike.
Follow these steps:
1) Start with a clean bar end (clutch side) and clean throttle tube. Use brake cleaner to ensure it's really clean. I use an aluminum throttle tube. If you cut the end out of the stock plastic tube for barkbusters, the tube will eventually crack and split. Not something you want on a device that controls rapid acceleration. I also polish the bar end under the throttle tube to make it really smooth. Little white lithium grease between the tube and bar, and it slides around like hot butter.
2) Squirt some Windex inside the grip to coat it, and on the bar end / throttle tube. Slide your new grips on. Align them.
3) Buy some good, thick safety wire and safety wire pliers. Well worth the investment. I do my bike and others multiple times a year. Safety wire the grips, using the grooves in the grips. Twist near the bottom of the grip... there should be a little notched out area to crimp and bend back the sharp end of the cut off wire back into soft rubber grip.
4) Your grips will not move if properly applied this way. I have worn holes in the palm of my gloves, and worn the grip rubber down to the bar, but they have not moved. When it's time to replace the grips, simply snip the safety wire off, slice the old grip length-wise to get it off quickly, and repeat step number 1. No muss, no fuss.