What is a common mistake people make when using sunscreen outdoors?

A common mistake people make when using sunscreen outdoors is not putting on enough product. Sunscreen needs to be applied liberally to effectively provide the protection it claims. Most individuals underestimate the amount needed, which is generally recommended to be about an ounce (the amount that fits in a shot glass) for full-body coverage. Insufficient application can lead to gaps in protection and increase the risk of sunburn and long-term skin damage.

The other options touch on different aspects of sunscreen use but don't emphasize the critical importance of quantity. Using only spray sunscreen can be effective, but it requires careful application to ensure even coverage. Applying sunscreen only once a day is not adequate in most circumstances, especially after swimming or sweating. Choosing a high SPF may provide a false sense of security, but the crucial factor remains the amount applied rather than just the level of SPF.