After doing some internet research I have opted for a hat. The majority of these commercial sunblocks contain estrogen. I'll let that speak for itself. In addition to that a lot of them contain ingredients that are actually carcinogenic to the skin. I did a more detailed post about this some time ago. It's appears under "Protection for Your Bald Head" and the thread is entitled "Sunblock Warning". It's on page 5 of the "Protection....." area. If I was going to use a sunblock I would do a detailed search for the ones that don't use these ingredients. My search revealed that the vast majority of the sunblocks use a combination of these substances and the ones that don't use them can get pricey. Having had a carcinoma cut out of my forehead once I have no desire to repeat that. To me a hat seems the safest, albeit maybe not the most stylish, way to go but I pride myself on being a "function ahead of form" type of guy.
Did you happen to find any safe products in your search that you could share with us?