Interesting reading. I got burned past extra crispy early last year when I posted a thread on this topic. I was relating a warning from the IMAA's High Flight magazine as to failure reports of the Ca hinges. In general, the text mentioned that fabric hinges hardened by Ca then exposed to UV rays tended to tear or break more often than should be expected. Since 2002, the plastic sandwich type has been introduced. If this will help, I'm not sure -- but has to be an improvement. None of my 1/4 and 1/3 planes are ARF's and are not using the Ca's. One person replied in divine wisdom by saying "If that was the case, why would we build the rest of the plane using Ca if it would fall apart".
It's bad enough when a 6 or 7 pound plane starts shedding parts; but, a 15 to 20 pounder is much more deadly and expensive.