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Yes wood should be fine. For the tables I've seen without a raised edge, people seem to make a barrier from tin foil to prevent the resin from leaking off. They then attach this with masking tape and then remove any stuck on tape/foil with a knife when the resin has dried. This seemed like a bit of a faff for me so I just waited until I found a table I liked with a lip around it. You could brush on the resin without a barrier but it will run off the sides and probably not cover the caps adequately (Its quite runny at first. Think maple syrup consistency).
Ah coins would be so cool! Only thing I'd say about using glue and then pouring resin over is I expect you'd get a lot more air bubbles leaking out from the space under the caps. However I'm sure if you watch it carefully for a couple of hours, blowing out the bubbles until they stop forming, it would be fine :)
Oh that would be so pretty! Can't wait to see pics when it's finished :)
Ha. It's actually an English rose bottle cap but I have no idea which beer it's from! I was torn between either that one, the owl or the bee!
Bottle Cap Tray Table With Grout and Resin
Made one too but used grout as well as resin! Check it out on my page for a step by step :)
Bottle Cap Tray Table With ...View Instructable »