Reactions to epoxy sanding dust

This subject came up on another thread and I was unable to give a difinitive answer, so I decided to do some checking. First the question was, "Would there be any advantage to using additive F in reards to reducing reaction to sanding dust?" I put in a call to Larry Pope who has , far and away, sanded more epoxies than anyone. In fact he's sanded more surfboards than anyone ( estimated 300,000 - 400,000). He has in the past had reactions to epoxy sanding dust and in a couple instences this has been sever. He first noted that evey time he's had a reaction he felt somewhat a fault for being lazy and not washing the stuff off in a reasonable amount of time. Also most reactions had to do with the sanding of glass rather than just resin as in a hot coat. With regard to sanding post Additive F (about the last 2 and a half years) he claims that he has had no ill effects in that time.
I have some e-mail to others in the surf, sailboard and boating along with some to others in the epoxy industry to get further opinions. I'll post them here.