12 Crucial Mistakes You're Making With Sunscreen And How To Fix Them

4. Quantity Matters: The Shot Glass Rule

One of the most common sunscreen mistakes is under-application. Dermatologists recommend using about one ounce, or a shot glass full, to cover the entire body. Many people apply only a fraction of this amount, reducing the effectiveness of the sunscreen. To ensure complete protection, be generous with your application. This means using enough product to cover all exposed skin, including often-missed areas like the ears, neck, and tops of feet. By adhering to the shot glass rule, you can prevent sunburn and cumulative skin damage, turning a common slip-up into a skincare strength.