I hate regripping my board. I also hate throwing things away that are still working and I also suck at accidentally breaking my boards, so I usually regrip once or in some occasions twice. Got some really sandy spots and spots with some stuff between small gravel and sand in size and that shit kills your grip. And like you said Zimmer, grip gum only does so much. Gets most of the shit out for sure, but that shit has had time to wear the grip down also, so it's not really helping much with the grip.