the paint sounds good, I have never tried it
but IME the problem with the brand of hair spray I used on a townie bike was the grip would slip when it got wet and grip again as it dried out and that residual product was still on the grip years later, I have since gone to using plain alcohol for push on grips which completley dries out
but I like the double lock-ons most cuz the out side ring protects the end of my grip from tagging stuff/ tearing and while riding on its side in the PU