Addendum
I spoke with my wife, who is a licensed esthetician and she recommended:
Epicuren Lip Balm - comes in stick or tub forms, spf 15 - no petroleum.
Another is Zilactin-Lip, also in stick form - indicated for sun blisters, dry, chapped lips and cold sores. spf 24 - no petroleum Zila Pharmacueticals I was not able to verify the existence of the product although, interestingly, thay are marketing the "Viz Lite Plus" for oral cancer detection
http://www.vizilite.com/