Stay away from surgical tubing or anything rubber.
Sage advice for so many discussions on so many forums… this may be worth adding to a signature, or two.
That amber-colored latex rubber tubing of yesteryear can be readily dissolved by the solvents that continue to flash off Nitrocellulose Lacquer finishes. At the very least, it becomes gummy and sticky which, in turn, interacts with the finish on the instrument and, before you know it, you have a soft, gummy goop on the back of your guitar neck, exactly in the place where your hand is least expecting it.
Slicone tubing, on the other hand… (no, don’t attempt to play the guitar with silicone tubing on the other hand). What I mean to say is, BY CONTRAST, silicone tubing (eg, silicone surgical tubing) may not interact negatively with NCL. Then again, there are hundreds of formulas for Nitrocellulose, especially post 1998 when the EPA mandated formulaic changes. We said “bye-bye” to the good ol’ stuff of the 50s and 60s.