I spent a lot of time on all-day rides in the sun, I buy those little suncreen sticks that look like deodorant applicators. The small ones can fit in a pocket and it takes 10-15 seconds to reapply. Suncreen in solid sticks seems a bit pricier but since I only do the face with it, I'm okay. I have arm/leg sleeves I use in the summer.
I also have a couple of neck gaiters that I got off amazon or ebay, pretty cheap, and they work well in cooler weather but hard breathing will fog up the glasses. I could never get used to wearing them in anything but cooler weather though.