I want to start off by thanking Lexvil for this tip. I can't take credit for it as I read about it in a thread that was a couple of years old. But, I thought it was worth reviving for all the new members here.
Basically what I've done is create an invisishield for my Gs. Very simple, and better yet, VERY CHEAP!! I bought some clear vinyl covering at WalMart. It looks like it's main purpose is for covering furniture. They have different "gages," so I got the thickest they had. It's on big rollers by the crafts section and is sold by the yard. I bought half a yard for a whopping $.49! This is going to be enough to protect about 100 Gs.
Step 1.) trace out a piece that will cover the face of your G. I used a sharpie, a pen would work fine.
STep 2.) cut out said piece and place over face of your G
Step 3.) While it's on the face, re-trace the outer face of the watch to get a more "exact" fit and trim again. It doesn't have to be perfect, but what I found is you don't want edges overhanging off the watch face. It needs to just sit on the top with no excess hanging off. Don't worry about making it EXACT to the glass, as the bezel will cover up the rough edges. In fact, leave room for error.
Step 4 and 5.) Clean the vinyl very good with soap and warm water. Get off any dust, streaks, finger prints ect. Go ahead and clean your G, too. While STILL WET, place the vinyl on the G and press it on with a towell. No need for adhesive, it will stick and not leave any air bubbles. Make sure it's lined up without any edges hanging over and place your bezel on. Simple as that!
The beauty of it all...you now have a scratch resistant G. If you don't like it, or it didn't turn out perfect, just take it off...remember, you didn't use any adhesive, so no nasty residue to clean off the glass!! Also, at $.49/half yard, you can afford to screw up many, many times!!!
WARNING>>>>> it's a little difficule to keep the vinyl in place when working with a bezel that's a tight fit, or if you have to get it over big buttons. My first attempt was with a GD100. At the 3 o'clock and 9 o'clock positions, the bezel comes right to the edge of the glass. Because I had to stretch it over those bulky buttons, it pulled the vinyl over the edge of the case just a hair, but enough to create a small air bubble in those spots. I'd have to point it out for anyone to notice, but I can see it and that's what matters to the perfectionists out there. For what it's worth, the King is VERY EASY to work with.
Another Plus to this mod...it HIDES SCRATCHES that are already on the glass!!! I have a good size nick right in the middle of my GD100, making me not want to wear it very much anymore. Now, with the screen protector on there, you can only see it at certain angles when the light hits it right. But not when I look straight down at it to check the time. Before, that was ALL I couls see!!
Is this right for ALL your watches? Maybe not. But those daily wearers or Grails that you want to wear AND protect...probably. A warning that needs not be said, but I will anyway, be very careful when working with a Vintage. Your bezel may seem to be in good shape, but if it's brittle and so much as hairline cracks when taking it off...STOP!!! Otherwise it will end up crumbling in your hand!
Anyway, thanks for reading, and I hope this helps some of you guys out. Thanks again to Lex!!!