My syncro has had a bra since before I bought it (bought 15 months ago).
Looks great but you definitely pay a price with (as you said) a rubbing off of
the paint createing a haze.  It also hides a fairly minor but noticeable
(w/out the bra) 2 foot long ding that was made before I bought it.  Bottom
line from my experience if you buy a bra you are going to have chafing after
time.  --note-- I leave it on all the time (except when I wash the car, then I
wash and detail the bra as well, along with putting two coats of wax on the
surface exposed to the bra).
Chris Wright
87 Syncro GL