I have the same problem.  I found this website   http://www.teatreasures.com/  (look under "How to Brew Tea") that says you can immerse the cracked china in milk in a pot, heat it for 45 minutes, then dry it off and let it set overnight.  The protein is supposed to seal the cracks.  I'm going to try it.  Good luck!
                 Verne
                
 December 2005