Before using MT I had to slather on the sunscreen and still managed to get burned several times. Now that I have a tan I'm not likely to get burned but still want to protect my skin from the sun. I'm particularly careful with not overexposing my face
My opinion is that even those of us on MT with dark tans should be using sunscreen when we're out in the sun. Even if you're very dark, heavy sun exposure can damage your skin.
First off, some sunscreen recommendations from Consumer Reports]http://www.webmd.com/beauty/sun/20140520/consumer-reports-sunscreens[/url]
It's not on the list but I really like Blue Lizard 30+ Sport, Very Water Resistant. It has zinc oxide in it among other sunscreens. It is truly very water resistant. I surf for a couple hours at a time, and it keeps me from getting darker or getting a burn.