I'm with you Osmium. I wear disposable neoprene gloves under some heavy-duty neoprene gloves, with a thick rubber apron over my labcoat, and then behind the sash of a fume hood. HF interferes with nerve signalling and has a low disassociation constant...That means you don't feel it, it doesn't burn, but it's readily taken up into lipid tissue. Only 25 square cm of skin exposure is needed for cardiac arrest. Nasty stuff.