[Paddlewise] Ceramic Knives

I have tried several knives for kayaking but all rust.  Has anyone  seriously 
looked into ceramic knives?  
 
I just need something I can use to cut away a paddle leash that tries to  
strangle me, or at worst a skirt that won't let go of someone else.   Spreading 
peanut butter is optional but probably the most likely use.
 
The knife needs to be strong enough to not chip and sharp enough to  cut.  
Anyone know of a reasonably priced, ceramic sport knife that would do  the job?
 
Brian Blankinship
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