BRH,
Big hello to you
One thing I wanted to add to what you posted about the importance of the sunscreen for hair, especially chemically processed hair. If you have a touch-up or a fresh color application done, be absolutely sure to stay out of intense sun for several hours after the service. It's supposed to be utterly horrible for the hair. Something like an extra-intense version of what BRH described.
I am not relaxed, but I would highly recommend the Infusium 23 UV Protectant formula, especially if you already use Infusium. If you are having problems locating it in the stores, you can order directly. Well worth the investment. I've been using it for several years now and have been most pleased. No fried, oxidated hair!
Most of Giovanni's hair products contain a sunscreen. The Direct Stay-In is a rich, creamy leave-in. The Vita-Profusion is much lighter, but protects the hair well.
I've heard the same about applying sunscreen lotion or cream directly to your hair. It's fine to do. I know several MEN who golf and do this all the time in the summer. I've done this myself, but only when I know that I will be out for extended periods AND I make sure to wash my hair thoroughly.
~Jade~