Being out on a bike day after day presents a challenge for keeping yourself from too much exposure. Much of the time you are in direct sunlight so SPF rated jerseys and sun screen are your main defenses. I do not have a “go to” brand for this stuff, it all seems to be about the same to me. The “Sport” or “Beach” advertising supposedly helps with it washing off from sweat. I use this very sparingly many times a day, using just enough to cover without trying to put on a “layer”. I use the same rule as lubricating fine mechanisms: “You should have enough on to feel it but not see it”
I have been using Coppertone Sport recently and it works well.