Trayke will likely have more detail, but you don't want to let wet things sit. You're unlikely to use your really fancy rest as a beverage coaster, but if you do, it will show rings that can't be removed except for a full strip and refinish. Things should bead up nicely though, so if anything accidentally gets on it, wipe down immediately and you'll be fine.
You shouldn't leave any urathane product in direct sunlight, and this urathane product in particular. You will experience significant yellowing. The flip side of it is this final finish will over time take a slight Amber cast and get a bit darker over time. It should result in a really beautiful, warm, rich finish that won't reach its "final form" for many years. Unless you blast it with UV and yellow it of course. So don't do that.