Why should oils be avoided before tanning?

Oils should be avoided before tanning because they can create a barrier on the skin's surface, which prevents tanning solutions from adhering effectively. This barrier interferes with the absorption of the active ingredients in the tanning products, ultimately leading to uneven results and a less effective tan. For the tanning products to work optimally, the skin needs to be clean and free from any substances that might obstruct the tanning agents. Proper preparation of the skin is crucial to achieve a uniform and desirable tan result, making it important to steer clear of oils that could compromise this process.