Does tanning myself with a tanning appliance prior to exposure to the sun (e.g. before going on holiday to a sunny country) help to protect my skin against sunburn?
Yes, but the effect is limited and also depends on the type of tanning appliance used as well as the way you expose yourself to ultraviolet radiation. Gradually building up the exposure to ultraviolet radiation helps prevent sunburn. However, using a sunscreen in accordance with the instructions is far more effective.