In reply to Baron Weasel:
They dont run out of the stuff, you get about half a second or so to watch them start wretching. Make the most of that time is my advice. I've tried waiting it out, and it didnt work.
Another trick is to "forget" your own jacket/ layer. Then borrow your mates spare. Try not to smile when you give it back....
One final note, it tastes really bad! Try not to put your gear in your mouth after passing fulmars.
But you knew most of that already I'm sure.
Enjoy the Old man, the Fulmars werent as prolific as I'd expected when we climbed it.