I bought some of these sprayers and they work great. I put different types of oil in one and the other I use vinegar. Just use it to spray as light and evenly as possible. It helps it stick.
The one that worked best for me was a squirt bottle, not a pressurized pump:
Evo Oil Sprayer Bottle, Non-Aerosol for Olive Oil and Cooking Oils, 8-ounce Capacity, Set of 2
I got this pair and use one for olive oil and one for avocado oil. Pretty convenient, depending on what you want to use it for. Good for salads, decent for coating a cast iron skillet for cooking. Not as good for putting 1/2c oil into a recipe, for example.