Waterproof sunscreen is a misnomer, as it really doesn't exist. Water Resistant is the correct term. Check the label on a new bottle of sunscreen and you'll see a time limit from 40 to 80 minutes. To keep protecting your skin, the sunscreen needs to be reapplied before that time is up.
There are two types of radiation received from our sun. SPF measures protection against UVB (ultraviolet radiation) that can cause immediate sunburn. UVA radiation causes invisible damage that accumulates over years of exposure. Check the label on the bottle for UVA/UVB Broad Spectrum protection.
Many of the name brand sunscreens include chemicals that are harmful to the environment and to humans. Avobenzone, parabens, and oxybenzone are just some of the chemicals that can bleach coral and can create skin problems when used over time. Look for sunscreen that coats the skin instead of being absorbed by the skin. Zinc oxide and titanium dioxide are good alternatives, as they reflect the sun's rays. Rubber Ducky sells all natural sunscreen in tinted and non-tinted versions. to For more information about sunscreen, check out the EWG's (Environmental Working Group) Sunscreen Guide...
The manufacturer's instructions for applying sunscreen will be something similar to this:
Lip balm can be found with SPF ratings that will protect your lips from dry, cracked skin, and blisters, while you're on land or out on a boat.
If you burn easily or don't want to mess with the sunscreen, try a long sleeve rash guard. These are meant to cover your torso and arms, so you'll still need sunscreen on your feet, legs, hands, ears, and neck. They are a great alternative when a full wet suit isn't necessary.