I am using some cheap crayola paint brushes. I used 3 throughout this. One for the glitter glue mix, one for the edges and a dry one to dust stray glitters off the shoes.
You can use a plate, paper plate or dish, tupperware container, pallet, cup, plastic cup, really anything you wish so long as you can mix!
If you find yet another layer necessary just make sure that each coat is entirely dry before adding another. Before wearing rub the bottoms or scuff on a sidewalk a little. Go make your world shine!