How to Thin Mineral Oil


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.

Things You'll Need

  • Measuring cup
  • Mineral spirits
  • Large empty can
  • Paint stirrer
  • 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.

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  • "The Haynes Automotive Body Repair & Painting Manual (Haynes Automotive Repair Manual Series)"; John Haynes; October 1989
  • Photo Credit BananaStock/BananaStock/Getty Images
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