That stuff is great for small quickie projects but for something as large as a bar, I’d do the stain step first, then apply an few coats of poly or Envirotex Lite. The problem I see is that the second coat will make it darker. You could probably just do a second coat of poly only.
Remember, stain isn’t paint. You apply it and wipe it off. I have a friend who did their cottage in T&G pine, then his wife jumped in with a bucket of stain and put it on like paint. Yikes! It was a mess!