Thanks for the replies. I also read through the attached link. On another forum, I spoke with a guy who used a 1 part epoxy, and through steelwork and welding, the floor is stained, but sound. I have pretty much decided on SealKrete "Epoxy-Seal", which is a 1-part acrylic-epoxy. Price (23.94 @ gal), and easy touch-up were the deciding factor. Also, a vast array of colors.

I am however still wondering if applying charcoal gray over white is feasible. I e-mailed SealKrete tonight, and will see what they say. If it wont work, I will just have to go with solid light gray without the "checkerboard". I will update this thread and post a couple pics when done.

Thanks to all for the info!
Greg