While the use of broad-spectrum SPF 30+ sunscreen can effectively block most UV radiation from penetrating your skin, you should never rely on sunscreen alone for protection. No sunscreen can block out 100 per cent of the sun's rays, so it is important to use sunscreen in conjunction with other methods of sun protection, including staying out of the sun in the middle of the day, wearing a hat and protective clothing, and keeping to shady areas, to reduce skin damage and the risk of skin cancer.

Sunscreen should not be used as a way of extending your time in the sun for sunbathing. If you are out in the sun for long periods, you will be exposed to enough UV radiation to damage your skin, even if you reapply sunscreen. Using sunscreen to extend time in the sun while sunbathing can increase your risk of melanoma-type skin cancer.