Originally Posted by: Steve Aphugh

One thing that has really helped build up my callusses is an old trick that I heard Eric Clapton swears by. Instead of vinigar, he uses rubbing alcohol, either dipping the tips of your fingers in a pool on a plate or dabbing with a cotton ball. Very cooling effect after practice and a quick drying effect that I'm sure is helping to toughen up my tips. Been working great for me! No blood blisters this time around.

I remember hearing about that years ago, but had completely forgotten about it until reading your post. Great tip. I hear saltwater actually works well also, though I've never tried it.