This is how is see it (if I present it wrong please correct it as I am not a musician):
1) Guitar owners care a lot about their guitars, the quality of them and caring for them properly, because the value the guitar gives to a music lover is both emotional and tangible.
2) Your company make a guitar stand that stops discolouration of the guitar lacquer which is an important aesthetic aspect of the guitar.
3) Real world customers care about this problem, and pay for solutions to it. An simple google search shows:
So assuming your product works, you have something of value customers are willing to pay for. Your competitors are alternative guitar stands (e.g. wood) and finish touch-up creams.
Therefore, you should socialise the venture amongst people in the business side of the music industry. You can find people who have made musical accessories and just call them up or look them up. Eg. custom guitar stand people.
From there you can work out a plan for partnership depending on how you feel about them as a business partner or co-founder. You can also work out how much money is need for a small production run and identify specialist music shops that would carry the product.
From there you have a handle on how much cash you need either from yourselves or an angel investor to get the first batch of paying customers.
After that, you have real leverage to see bigger markets, expand the product and get series A funding to really ramp up.
If you want to chat more, feel free to look me up on Linked In. However, given the contacts referenced earlier, try them first for an in-industry perspective.
I wish you the best of success.