Mineral oil is used to apply a light, permanent coating of lubrication. For example, some race car pit crews spray a thinned-out mineral oil coating onto tires to help them last longer in a race. To apply mineral oil with a sprayer, it must be slightly diluted so it can flow freely through the spray gun. Mineral spirits will properly dilute mineral oil without removing its beneficial properties.
Fill the measuring cup with mineral oil to the 2/3 cup line.
Pour the mineral oil into a large, empty can.
Fill the measuring cup to the 1/3 line with mineral spirits.
Pour the mineral spirits into the can with the mineral oil. This creates the 60 percent to 40 percent mixture commonly used when thinning mineral oil down for use in a paint sprayer.
Stir the mixture together. If you need to thin the mixture further, add more mineral spirits, 1/3 cup at a time, until the mixture is thin enough.