Stop in for a cup of coffee

Good luck. Never used the POR but tried several, including Eastwoods that was not supposed to rust. Everything I used did though, until I started with the spray graphite.
I didn't use POR15 products before, but see many guys swear by them. Figured it has to be better than the VHT did. If nothing else just the thickness of the coating as a brush on vs spray should help. And as you said the graphite requires regular touch ups so I guess there ain't much getting around it...