The same rules apply when you are going for a dip in the pool -- apply generous amounts of sunscreen and re-apply every two hours.
"Consumers should be aware that no sunscreen is waterproof, because ultimately all such creams get washed off.
They can be water resistant, but those that are labelled so should also state whether they remain effective for 40 minutes or 80 minutes when swimming or if you perspire.
Also there should be directions on when to re-apply," Patel said.
