ah, yes, military issue repellant, about 75% deet iirc, plenty of it was available at our college (Paul Smith's) most of our forestry classes entailed outdoor studies, and blackfly season in the Adirondacks is April to September. good paint remover
or the original "Old Woodsman" I think a blend of camphor and turpentine that never washed off
I resorted to smoking cigars