Thanks for the suggestions.To surface-mount a comic book or elevate it off the background showing all edges, wrap it in clear polyester film, aka Mylar-D or Melinex 516, or polypropylene clear film, aka Invisimount.
The polyester film creases most sharply and has excellent clarity, but it's glossy. Invisimount doesn't crease as well and stretches a bit, but it has a non-glare surface and lower clarity. Either way, use polyester double-sided tape to assemble the wrap, with no adhesive touching the book. Never use ATG for this, because it always fails.
If the book is to be removable, you can make a Removable Book Mount out of the clear polyester film, but the polypropylene film would not be rigid enough for that. Again, no adhesive on the book, and it's removable/replaceable through the back of the frame.
Or, if you don't mind covering the edges, you could sink-mount the book.
Thanks for the suggestions.I just float mounted a vintage Batman comic by using a large mylar strap just a bit smaller than the width of the comic. Cut two slits in the substrate slightly larger than your mylar strip just about an eighth inch below where you'd like the comic on the substrate and an eighth inch above the bottom of the comic. Feed the strip through the slots and then slide the comic book in with the front page open. Pull the strips tight to hold the body of the comic and attach on the back with PVA glue and tape. Use acrylic glazing and space the depth in your frame so the front page just rests against the glazing. In this case it was Optium Acrylic so it looked like there was no glazing at all. If you use glass, you'll need to have the mylar strip cover the front page too so that the page doesn't touch the glass.
Alternatively you can cut a piece of rag board slightly smaller than the comic and adhere the strip to the back of the rag board then glue the board with a couple dollops of pva glue on the substrate.
Sorry I don't have any pictures of this last project but it looked great. I did caution the customer not to jar the frame especially on its side so that the book wouldn't slip in the package.
Thanks for the suggestion.I've sink/platform mounted many comic books. It is nice in this way because there is absolutely no adhesive anywhere near the book. The only negative is the top mat is what hold the comic book in place so it doesn't fall forward. You have to cut the top mat just slightly larger so it overlays the very edges of the comic book causing you to loose about 1/8" on all sides so you don't see the full cover. I like the way that both Jim and Dave does it but for another technique the sink/platform mounting does work good and my customers do seem to like it in this way.