Finsihing a walnut dash board

I am trying to get a nice finish on a walnut dashboard.
Yesterday I applied three coats of Miniwax High Gloss Clear Quick Drying 
polyurethne, with a small foam rubber brush.
Th finish is too uneven
I can easily sand it out and start all over again. or just rub down the high 
spots in the finish.
I was thinking of trying something in a spray can.

Suggestions?

David Oliner