I own/fly a Glasair II which is of composite construction. Vinylester resin and fiberglass (can’t remember if E glass or S glass). I think the vinylester resin is a Durakane 411-350 product. Over the years I’ve read a few documents and posed questions in a couple places asking if these unleaded fuels have been tested for compatibility with composites. I haven’t seen anything one way or the other. Maybe I’m not looking at the right things. Stuff like Xylene is a solvent/thinner for epoxies and resins. This has me greatly concerned.