Albert,
I just went to Best Buy and purchased some screen protectors designed for cell phones. I got the stuff that is apparently used to coat helicopter blades (could be a marketing ploy but whatever). The kit came with a template you can use to mark the dimensions of your screen and cut to fit. It has been on my camera for about a year and no signs of coming off.
Also, I’m not sure about the 60D but the 7D doesn’t have any safe title guides like a regular video camera. So, I used After Effects to set up a blank comp with the safe title guides turned on over a black solid, grabbed a screen shot and went into Photoshop. I measured the dimensions of the screen on my camera in video mode keeping the gray bars on the LCD screen in mind. Then created a PSD to to those dimensions and imported my screen shot and sized the comp window to match. Then did a simple invert to make the safe title guides black and the background white. After that I printed it out on a transparency and cut to fit. I have the PSD available if you would like it. I made a border so I would know where to cut on the transparency so it would match the screen size (3 inches). It does get in the way of the display a little bit but not bad. I would recommend printing this out on a laser printer. I tried an inkjet (that didn’t go so well) and even a couple of different colors but black worked the best.
So in essence I have two screen protectors on my camera and I don’t see any color variation other than what appears to be a few air bubbles but no big deal.
Hope this helps you out a little,
Jim