I vote for bad idea. I'd leave it alone, assuming that the factory that made it had access to good spray equipment and curing conditions that will provide at least as much protection as anything you could add on top of it. And is probably a smoother finish with a more even sheen than you can get at home too.
I'd leave it alone, then if it doesn't hold up to use (but no reason to think it won't), tackle refinishing the top (sanding/scraping carefully to not get through the veneer).
I'd leave it alone, then if it doesn't hold up to use (but no reason to think it won't), tackle refinishing the top (sanding/scraping carefully to not get through the veneer).