Mix both the sugars, cinnamon, and salt together in a bowl.
Whisk egg white and water together in a separate bowl until frothy.
Toss pecans in the egg white mixture.
Sprinkle the sugar mixture on the egg white-pecan mixture until evenly coated.
Spray a foil-lined baking sheet with non-stick cooking spray to prevent pecans from sticking.
Toss the coated pecans on the baking sheet and bake in the preheated oven for about 1 hour, or until pecans are fully browned. Stir every 20 minutes or so to ensure even baking.