I never really go to the beach because I have to put on every 5-10 minutes because I have very fair skin. Interestingly enough, I never tan. It just becomes a red rash when I'm in the sun too long.
You need a high spf sunscreen, preferably spf 50 (at least spf 15), and one that protects from UVA and UVB.
If you properly apply that it will take 50 times longer for you to burn as it does without.
By rights you shouldn't need to reapply, provided it takes you 20-30 mins to burn, unless you go in the water (reapply even if using waterproof sunscreen)
Just remember to apply it to your thinnest and most exposed skin, such as the ears (and behind them), the face (with attention to the nose), the back and front of the neck, your shoulders, and feet if you have exposed feet.
I mean, do the whole body really, but don't forget those areas as they burn easiest and are often the most painful places to burn.
Also pay good attention to any moles. Check them afterwards for any signs of change. If there are any get them checked by a doctor ASAP. They could lead to skin cancer.
