I've played guitar for a little over a decade now. But have never ventured into playing blues, let alone a slide *sad I know*. Today I decided to make my own slide, but I don't drink, so I don't have any of those handy wine bottles layin around. But I came across a box of copper tubes that fit just right around my finger, so I took a couple, pieced them together in a nice fashion, took a fine grade sand paper on one of my dads machines and polished it up really nice.

Monolog aside, I was wondering if having used the sand paper if it will be harder on my guitar? It seems very very smooth, and looks fantastic, but I'd like to cause as little ware on my strings as possible. Any advice is helpful :) thanks guys!