Here is some info about the epoxy based stuff, I think the decoupage stuff would get rather expensive to get the desired thickness you should have. Also you can put down bands and a 1/8" epoxy coating, let cure and add a second coat of bands and epoxy for a 3D type look. this will allow you to cover mistakes and possibly use less bands.
http://www.epoxyproducts.com/bartop.html
or
http://www.mrfiberglass.com/table_top_clear_resins.html