Being one who forgets easily, I am not comfortable with sticking tape
on a tracker bar unless it can be removed easily, even if forgotten for
a while.  The idea of using thin plastic and putting the tape somewhere
other than on the bar itself is a good one but my method works too.

I often have to cover the whole bar while testing my various MIDI
interfaces and find that the best tape is blue painter's masking tape
made by 3M.  I also use archival book tape called Filmoplast.  It has a
low tack adhesive and comes in different thicknesses.  Using a cheaper
brand of masking tape is not a good idea.  Adhesive may protrude from
the edges and stick to the paper.  Just about any other problem can be
found with cheap brands such as Anchor, so go for the best and spent
the extra 50 cents for the 3M stuff.

Either of the above mentioned tapes will be easy to remove without
damage, even if left on the bar for months.

Another possibility is to use thin (.5 to 1 mill) Mylar such as used
for balloons, wrapping paper or the one inch tape found in nurseries
for repelling birds.  It can be taped above and below the bar as
suggested for the thin plastic bag material.  The advantage is that it
is very strong and very thin and also nicely slippery so it will not do
any damage to the paper roll.

Spencer Chase
http://www.SpencersErolls.com/