ive never painted a vehicle with bedliner material, but i have sprayed undercoating, and bedliners. and i paint cars. never done a pathfinder, but i did a cherokee (similar size) 2.5 to 3 quarts will give you about 4 good heavy coats. but that stuff is thick, and it doesnt take long to spray a gallon:) good luck, hope it turns out for ya