Yes you are correct that’s how it works. The box or web site I thought mentioned about how thick / pour you can go ? Most important though is to seal the seam between your bar top and the trim. If you don’t you’ll have low spots where the envirotex ran out. Use matching colour of wood filler or even urethane etc… to seal the entire seam.
Also, the torch seemed to work better at removing trapped air bubbles after the pour.