After finding an issue and identifying a potential solution, how can I determine if people will actually buy the product to solve that issue?

I’ve been stuck on this step for a while. I’m hesitant because I don’t want to spend the time developing something and looping other people in, just to have it fall flat on its face because other people don’t see a need to purchase the product.Here’s the example:as a guitarist, I struggle a lot with sweaty fingers and palms when playing. The problem is this can negatively affect your playing. If I’m doing a full pitch bend and my fingers are sweaty this can cause the strings to slip from my grasp or It can cause me to miss the right pitch and I’ll end up playing a sour note. It also causes problems holding a pick correctly when strumming as I can lose my grip on it.I know this is a common issue for other musicians as they have also described it. The issue is much worse when you’re playing outside in the heat and if you’re a gigging musician, this kind of problem mid song can ruin your set.I’m thinking of developing an astringent based spray that can help with perspiration and dry out your fingertips. My issue is - how do I know people will even be interested in using this? Why would someone pay money for this? I know currently, musicians use other techniques to prevent this problem like a towel, talcum powder, washing hands with soap and water, etc.Sorry if this is a dumb question, I am new to this and would love to hear some feedback on this question. I can use the information for future ideas! Thank you see hubwealthy.com/wealthy