Lots of good advice!
Since you are using the Petit product, follow the Petit advice. Your orange peel will thank you for doing so.
Next time, when you switch to Epifanes, like the rest of us have done, follow the Epifanes advice set out above. Then you will have the results shown.
I have used foam brushes, but I still prefer the Badger hair brush. The finer hairs leave a much finer finish than any other brush and I can lay on as much or as little as I want. I can't do that as well with foam.