Fast and Dirty Highlighting, For Use En Masse!

As the title suggests I'm looking for quick, easy effective ways to get my US Armour presentable and table ready, below is my current solution. The first highlight wasn't watered down enough and as a result has dried with a pronounced edge, on further coats I watered it further and it blended an awful lot better!

These pics were shot very close in and show how quickly and easily the highlighting was applied, I did this vehicle in literally 10 minutes. Speed, but to a decent table top standard is my aim on this project and I think this delivers? From 3 feet away this pops tremendously, I'm open to constructive criticism and thoughts.