One of the most important parts of being a founder is recognizing when you are out of your element, and then finding someone else to help you round out that problematic area. For you this might be sales/marketing. You definitely should find someone to help you here.
On a side note, as a fellow climber, I think you're probably going to fail. Chalk is cheap relative to your product and your product doesn't offer any clear advantage aside from leaving less residue (which lets be honest most climbing areas already have a ton of chalk on them). Maybe a small minority of climbers care that much to use something that leaves less residue, but those people already probably brush the holds on the way down anyways.
On a side note, as a fellow climber, I think you're probably going to fail. Chalk is cheap relative to your product and your product doesn't offer any clear advantage aside from leaving less residue (which lets be honest most climbing areas already have a ton of chalk on them). Maybe a small minority of climbers care that much to use something that leaves less residue, but those people already probably brush the holds on the way down anyways.