I've read that the close grip bench is a great exercise for increasing your bench, but whenever I try them, my wrists hurt like hell. Is it a form issue, or is it just that some people can't do close grip benches?
My wrists also give me trouble if I do straight bar curls or skull-crushers. Maybe I have bad wrists.
See how my arms and wrists look in this photo? That's the type of form you should use. Also, I am small and have narrow shoulders, so I put my pinkies on the edge of the knurling and the rest of my hand is inside the smooth part of the bar. If you are bigger, this hand spacing would be too close for you and you will need to move out to about 14".
It's not a very natural position for your wrists, especially under heavy loads. Warm-ups and stretching will help. I often use an EZ-curl bar to do both skull crushers and close grip bench. Try doing your set of crushers with the EZ-bar, then rep out on close grip presses to failure. You'll feel that in your triceps the next day!