I use a "rusty" guitar slide because it sounds louder, clearer and better than a regular guitar slide. But will it break the strings?
Yes... I only play on rusty gear too. In fact I always dip new equipment in a saltwater solution and let it dry outside. I like the rusty tone quality my gear gets from that treatment.
@bass bass bass - Since you are a new member, I'll let you know this is a great place to get info. It can also be a haven for sarcasm. Unfortunately, the term you used "guitar slider" isn't an accurate term for a guitar/bass part. So we really don't know what you are referencing. If you can add any information as to what a "guitar slider" is, I'm sure plenty of people will chime in with opinions as to whether a rusty one is better or not. Otherwise, members think you are trolling them, and will be very sarcastic. Good luck!
The English language is so ambiguous. Do you mean a slider for a rusty guitar or a rusty slider for a guitar? Could they both be rusty? You should really take better care of your gear.