Incorrectly applying sunscreen can result in the actual sun protection effect being an SPF much lower than that listed on the sunscreen.
When determining a product’s Sun Protection Factor (SPF) in sunscreen testing laboratories, scientists use around double the amount of sunscreen in an application compared to that applied by the average consumer.
Sue Heward SunSmart manager at Cancer Council Victoria recommends the average person using about 35 millilitres (around 7 teaspoons) of sunscreen for each application.
Sunscreen application tips:
Use the right amount
Apply 20 minutes before you go outside
Reapply every two hours
Source – Correct sunscreen application reduces skin cancer